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Marek Lecián

@mareklecian.bsky.social
434 followers 290 following 148 posts

Web & data #Analyst | #OnlineMarketing Geek | Freelancer 🇨🇿 🇪🇺 #measure #GA4 #GTM #sGTM #PiwikPro The questions may not make sense, but the answers do. I write posts in two languages English and Czech. linkedin.com/in/mareklecian/

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Marek Lecián @mareklecian.bsky.social · 13/08/2026
How to Become a Web Analyst in 2026: Skills, AI & Tools mareklecian.cz/en/how-to-be...
mareklecian.cz
How to Become a Web Analyst in 2026: Skills, AI & Tools | Marek Lecián
Learn how to become a web analyst in 2026: what to learn, which tools to use, how AI can help, and a practical 90-day plan to get started.
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Marek Lecián @mareklecian.bsky.social · 10/08/2026
Do We Still Need Google Tag Manager in the Age of AI? New article: mareklecian.cz/en/do-we-sti...
mareklecian.cz
Do We Still Need Google Tag Manager in the Age of AI? | Marek Lecián
AI agents can now implement analytics tracking in code. So do we still need Google Tag Manager? A practical guide to when GTM helps and when it doesn’t.
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Marek Lecián @mareklecian.bsky.social · 22/05/2026
My review of the Gemini 3.5 Flash, Antigravity Cli, and Antigravity 2.0 Gemini 3.5 Flash... in a nutshell: Surprisingly fast, average in inteligence and above-average in price. mareklecian.cz/en/google-i-...
mareklecian.cz
Google I/O 2026: Gemini 3.5 Flash, Antigravity CLI, and Antigravity 2.0 Through a Developer’s Eyes » Marek Lecián
Short version: I expected more from Google. Not because Gemini 3.5 Flash is an unusable model or because Antigravity has no direction. The problem is
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Marek Lecián @mareklecian.bsky.social · 05/01/2026
New Release notes for Google Tag Manager: Google tag gateway for advertisers via Google Cloud Platform is now in available in Beta
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Marek Lecián @mareklecian.bsky.social · 31/12/2025
PF 2026: wishing you more signal than noise. May your measurement be gap-free, consents as high as possible, and your data flowing. Measure it right, optimize calmly, scale with confidence. May AI deliver real value, and may you feel calm and happy.
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Marek Lecián @mareklecian.bsky.social · 11/12/2025
New feature in #GoogleTagManager The following variables have been officially added to #GTM: - Analytics Client ID - Analytics Session ID - Analytics Session Number This means you won't have to hack it anymore, which means there will be less chance of breaking it.
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Marek Lecián @mareklecian.bsky.social · 01/12/2025
New Article Google Gemini 3.0 Pro: Hype vs. Reality - My Perspective. mareklecian.cz/en/google-ge...
mareklecian.cz
Google Gemini 3.0 Pro: Hype vs. Reality - My Perspective. » Marek Lecián
I believe, however, that for many it will be a revolution, simply because they don't constantly try out all the new models. So, the difference between their
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Marek Lecián @mareklecian.bsky.social · 01/12/2025
New Article: What can be measured with AI tools? A complete guide to measurement, from bot visits to reputation in LLM mareklecian.cz/en/complete-...
mareklecian.cz
What can be measured with AI tools? A complete guide to measurement, from bot visits to reputation in LLM » Marek Lecián
I’m writing this to organize my thoughts and have a reference for colleagues, but I’m happy to share it as well, so let’s get to it!
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Marek Lecián @mareklecian.bsky.social · 27/10/2025
New article! #GA4 #GTM I wrote a guide on how to measure citations from Google AI mode and #AIOverviews. 💡Why would you want to do this? The measured data contains texts cited by AI on your website, which can be used to optimize #SEO / #GEO, etc. mareklecian.cz/en/ga4-guide...
mareklecian.cz
GA4 Guide - Measuring citations from Google Ai overviews and AI mode » Marek Lecián
So let’s break down what’s actually happening, why you should care, and how you can measure it in GA4.
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Marek Lecián @mareklecian.bsky.social · 07/08/2025
Official OpenAI post about GPT-5 openai.com/index/introd...
openai.com
Introducing GPT-5
Our smartest, fastest, most useful model yet, with built-in thinking that puts expert-level intelligence in everyone’s hands.
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Marek Lecián @mareklecian.bsky.social · 27/07/2025
Google Gemini vulnerability, where all you need to do is send an email with hidden text to the owner with Gemini enabled in their workspace, and the user doesn't even have to open it for the attacker to run scripts via Gemini that read such an email. 0din.ai/blog/phishin...
0din.ai
Phishing For Gemini
A researcher that submitted to 0DIN demonstrated a prompt-injection vulnerability in Google Gemini for Workspace that allows a threat-actor to hide malicious instructions inside an email. When the rec...
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Marek Lecián @mareklecian.bsky.social · 22/07/2025
🚀Google Analytics now ships default Lead Acquisition reports. Populate them by sending the new lead-gen events: - generate_lead - qualify_lead - disqualify_lead - working_lead - close_convert_lead - close_unconvert_lead via Measurement Protocol or CSV import. #GA4 support.google.com/analytics/an...
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Marek Lecián @mareklecian.bsky.social · 21/07/2025
#GA4 #update Import cost data from Reddit Ads. This won't be for many people, but I believe it will make a few people happy. support.google.com/analytics/an...
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Marek Lecián @mareklecian.bsky.social · 19/07/2025
Nový článek: Připravíte AI agentům bezbariérový vchod a nebo je pošlete ke konkurenci? #SEO #AI #agents #Accessibility mareklecian.cz/pripravite-a...
mareklecian.cz
Připravíte AI agentům bezbariérový vchod a nebo je pošlete ke konkurenci? » Marek Lecián
Možná si říkáte, že přístupnost je noblesa pro nevidomé a do marketingové KPIs se nevejde.
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Marek Lecián @mareklecian.bsky.social · 19/07/2025
My New Article: AI-First Accessibility: Turn Legal Pressure into a Competitive Edge mareklecian.cz/en/ai-first-... #SEO #AI #agents #Accessibility
mareklecian.cz
AI-First Accessibility: Turn Legal Pressure into a Competitive Edge » Marek Lecián
You might be thinking that accessibility is a noble gesture for blind users and has no place in marketing KPIs.
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Marek Lecián @mareklecian.bsky.social · 17/07/2025
#AI OpenAI Operator 2.0. In the normal chat interface, you put /agent and in the chat the agent will launch its own browsers and handle live stuff on the internet. Multiply smarter etc. Plus - 40 queries per month In EU you will need to use VPN openai.com/index/introd...
openai.com
Introducing ChatGPT agent: bridging research and action
ChatGPT now thinks and acts, proactively choosing from a toolbox of agentic skills to complete tasks for you using its own computer.
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Marek Lecián @mareklecian.bsky.social · 17/07/2025
#MCP server for #GA4 Server that you connect to LLM and then you can talk about your data in GA4 and it will pull everything you need from GA4 servers. Cool stuff for me and I'm pretty excited, finally this could be a usable AI analytics tool for GA4. github.com/googleanalyt...
github.com
GitHub - googleanalytics/google-analytics-mcp
Contribute to googleanalytics/google-analytics-mcp development by creating an account on GitHub.
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Marek Lecián @mareklecian.bsky.social · 15/07/2025
#GA4 update Item data import improvements support.google.com/analytics/an...
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Marek Lecián @mareklecian.bsky.social · 09/07/2025
My new article: Do you use the word “ads” in your code? Get ready for an invisible website or part of it! Article about which words to avoid and in which places, but you part of the site not blocked by AdBlockers. mareklecian.cz/en/do-you-us...
mareklecian.cz
Do you use the word “ads” in your code? Get ready for an invisible website or part of it! » Marek Lecián
So if you want to keep your UX (and your sanity) intact, keep reading. Today I’ll show you why ad-blockers hunt anything that smells like advertising, where
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Reposted by Marek Lecián
Mehdi Oudjida @mehdioudjida.bsky.social · 19/06/2025
Piwik PRO announces the end of its FREE plan in December, replaced by a supersized SME Business plan for 35 euros / month A good move in my opinion. Here my thoughts: www.linkedin.com/feed/update/...
linkedin.com
Piwik PRO announces the end of its FREE plan in December. | Mehdi Oudjida
Piwik PRO announces the end of its FREE plan in December. It will be replaced by a paid Business plan with a 30-day free trial. This marks a turning point for Piwik PRO, which is shifting its acquis...
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Marek Lecián @mareklecian.bsky.social · 22/06/2025
Click-free shopping? AI agents change the rules of the game, will it kill advertising? Will it kill UX? mareklecian.cz/en/click-fre...
mareklecian.cz
Click-free shopping? AI agents change the rules of the game, will it kill advertising? Will it kill UX? - Marek Lecián
People often underestimate that today’s “AI summaries” in search are only the gateway to a far deeper change: shopping and service management that will be handled for us by highly autonomous software ...
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Marek Lecián @mareklecian.bsky.social · 22/06/2025
Google AI Overviews and AI Mode: Top studies, analysis and recommendations (Update: 2025-06-22) (Live article, updated) mareklecian.cz/en/google-ai...
mareklecian.cz
Google AI Overviews and AI Mode: Top studies, analysis and recommendations (Update: 2025-06-22) - Marek Lecián
A selection of the highest quality resources and studies on Google AI Overviews and AI Mode in Search. Find out their impact on SEO, website traffic and the future of organic results.
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Marek Lecián @mareklecian.bsky.social · 22/06/2025
I've kind of neglected it here, so a couple of articles I've written in the meantime. The impact of Google AI Overview on the Internet’s digital ecosystem mareklecian.cz/en/the-impac...
mareklecian.cz
The impact of Google AI Overview on the Internet's digital ecosystem - Marek Lecián
AI and SEO is a big topic for me personally, so I felt it was my duty to write this article. I’ll warn you in advance that the article is roughly 47 standard pages long. But I think it’s important, be...
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Marek Lecián @mareklecian.bsky.social · 23/04/2025
#Google News / not news Such a classic 3rd party cookies remain. privacysandbox.com/news/privacy...
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Marek Lecián @mareklecian.bsky.social · 07/04/2025
#GA4 #Update It wasn't a bug, it's just been missing until now.
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Marek Lecián @mareklecian.bsky.social · 20/03/2025
How to create #GA4 traffic report from #AI tools. #PictureThis #guide Is there a lot of traffic from AI? No How is this AI traffic growing? Really fast. mareklecian.cz/en/how-to-cr...
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Marek Lecián @mareklecian.bsky.social · 17/03/2025
AI WOW super HYPE... New image generator!!! New video generator!!! Will I use it? No. Because I had no use for it before, now or probably in the future. I like the cleverness, the precision, the vibe :) . I don't even need to count the letters in words.
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Marek Lecián @mareklecian.bsky.social · 14/03/2025
#AI In the Google Gemini app, all users now have 5 deepsearch queries per month.
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Marek Lecián @mareklecian.bsky.social · 12/03/2025
#GA4 update - Percentage values in Google Analytics report tables - Missing session start notification - High not set rate notification
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Marek Lecián @mareklecian.bsky.social · 03/03/2025
Google Ads has had a global #outage with ad serving for the last few days. Some Google ads accounts have stopped serving ads since 1.3.2025. The fault is not on your side . P.S. If your PPC guy doesn't know, tell him not to worry :) . www.seroundtable.com/many-google-...
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Marek Lecián @mareklecian.bsky.social · 26/02/2025
DeepSeek has made the API cheaper. Let's just say you don't pay... with money.
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Marek Lecián @mareklecian.bsky.social · 18/02/2025
Due to Musk's support of Russia, I will not report on anything he has created, including AI models.
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Marek Lecián @mareklecian.bsky.social · 17/02/2025
#GA4 New Beta feature, change alerts integrated directly into the chart and table interface. When clicked, this will create a segment with a slice of the data. This alert on is not in "Insights". So far, it found that I published an article :) .
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Marek Lecián @mareklecian.bsky.social · 15/02/2025
#AI News Perplexity Pro has released its Deep research. 120 sources on 4 standard pages of text. Good. The fact that they are acting more like an AI integrator is a pretty big plus in this day and age full of innovation and by being able to adapt very quickly, it works.
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Marek Lecián @mareklecian.bsky.social · 15/02/2025
#AI Notice that reasoning models have to enter prompts differently. The point is that the "hacking" of prompts that was done and taught for GPT3 and 4 actually screws up the reasoning model result. Recommendation from OpenAI: platform.openai.com/docs/guides/...
platform.openai.com
OpenAI Platform
Explore developer resources, tutorials, API docs, and dynamic examples to get the most out of OpenAI's platform.
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Marek Lecián @mareklecian.bsky.social · 14/02/2025
Earlier: "This meeting could've been an email." Later: "This could've been answered with a quick Google search." Now: "This meeting could've been just one ChatGPT query." #AI
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Marek Lecián @mareklecian.bsky.social · 08/02/2025
That damn smile, I've seen that one a long time ago :). #SEO Matt Cutts - Administrator of the U.S. Digital Service medium.com/the-u-s-digi...
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Marek Lecián @mareklecian.bsky.social · 07/02/2025
When you finally hear the keyword density sweet spot in 432Hz. #SEO
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Marek Lecián @mareklecian.bsky.social · 07/02/2025
The evolution of Google: 2000 added the phrase "Don't be evil" 2015 started deleting this phrase and moving it to less visible documents. 2018 Google deleted the phrase altogether 2025 Now deleted that they will not use AI in weapons and for surveillance. www.theguardian.com/technology/2...
theguardian.com
Google owner drops promise not to use AI for weapons
Alphabet guidelines no longer refer to not pursuing technologies that could ‘cause or are likely to cause overall harm’
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Marek Lecián @mareklecian.bsky.social · 03/02/2025
#GA4 News Now cost import will no longer need campaign_name and campaign_id. Just source, medium and date will be enough, which will make it easier to import costs into GA4.
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Marek Lecián @mareklecian.bsky.social · 03/02/2025
#new #article Take Back Control: Why Your Business Must Own Its Domains, Data, and Accounts mareklecian.cz/en/take-back... #onlinemarketing #web
mareklecian.cz
Take Back Control: Why Your Business Must Own Its Domains, Data, and Accounts - Marek Lecián
In recent days, I came across a troubling case where an agency owned a client’s domain. The moment the business owner wanted to switch providers or make
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Marek Lecián @mareklecian.bsky.social · 31/01/2025
#new #article Back to Basics: Why Clean Data Trumps Advanced Analytics mareklecian.cz/en/back-to-b...
mareklecian.cz
Back to Basics: Why Clean Data Trumps Advanced Analytics - Marek Lecián
But time and time again, I encounter situations where, even if someone’s using server-side GTM or has an impressively advanced Google Ads setup, the final
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Marek Lecián @mareklecian.bsky.social · 29/01/2025
#Analytics #event The most hardcore analytics event #supervveek Analytics Summit also includes Superweek TV. So I recommend all analysts to keep an eye on it. This is where you'll hear the coolest topics that will be covered in the coming years. www.youtube.com/watch?v=xh8f...
youtube.com
🔴 SPWK TV 2025: Wednesday, January 29th
YouTube video by Superweek Analytics Summit
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Marek Lecián @mareklecian.bsky.social · 27/01/2025
#Piwik Pro #CDP is now available for free to all users. #CustomerDataPlatform piwik.pro/blog/custome... I'm going to test it :)
piwik.pro
Customer Data Platform is now available for all Piwik PRO users - Piwik PRO
Discover the enhanced Core plan of Piwik PRO Analytics Suite, now featuring a powerful Customer Data Platform (CDP). Explore its features without any upfront costs while growing with your business nee...
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Marek Lecián @mareklecian.bsky.social · 27/01/2025
#AI I can't deny that DeepSeek is a powerful AI model. But really beware that if you don't have this model locally, you are really sending data to China! The fact that it has cheap API calls / free mobile app means you are paying with your data and your clients' data.
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Marek Lecián @mareklecian.bsky.social · 24/01/2025
#AI I have hardly used Google search in the last 2 weeks. It's enough for me: - OpenAI SearchGPT - Perplexity Pro - On my mobile I sometimes use DuckDuckGo and Brave Search. - I search YouTube and other services directly. - DeepSeek search
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Marek Lecián @mareklecian.bsky.social · 23/01/2025
#GA4 News In GA4 Explorations you can now copy a report from one GA4 property to another. Which is a nice improvement. They could still do better sharing in the team :) . support.google.com/analytics/an...
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Marek Lecián @mareklecian.bsky.social · 21/01/2025
#AI models DeepSeek-r1 is now the king of opensource local LLM. ollama.com/library/deep...
ollama.com
deepseek-r1
DeepSeek's first generation reasoning models with comparable performance to OpenAI-o1.
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Marek Lecián @mareklecian.bsky.social · 20/01/2025
Více obsahu a nebo kvalitnější obsah díky AI? Volba je na vás.
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Marek Lecián @mareklecian.bsky.social · 20/01/2025
#AI content... The choice is yours
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