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Dhrumil Mehta

@dmil.bsky.social
169 followers 71 following 17 posts

Data Journalism Prof. @ Columbia University and Deputy Director of Tow Center for Digital Journalism.

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Reposted by Dhrumil Mehta
Tow Center for Digital Journalism @towcenter.bsky.social · 27/08/2026
We found Polymarket's AI-generated news summaries are full of errors, from misrepresentations and misattribution of news to outright fabricated references to nonexistent news stories. By @tlysik.bsky.social www.cjr.org/tow_center/p...
cjr.org
Polymarket calls itself News 2.0. Its AI is feeding users fabrications.
The prediction market fancies itself a “global truth machine” and a boon to journalism. Tow finds a very different reality.
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Dhrumil Mehta @dmil.bsky.social · 27/08/2026
Good work by @tlysik.bsky.social.
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Dhrumil Mehta @dmil.bsky.social · 27/08/2026
If you want to see how Polymarket's summaries represent your own news organization's coverage, a full dataset of AI-generated summaries and citations that appear on every market with over $1M at stake is available here. github.com/TowCenter/po...
github.com
GitHub - TowCenter/polymarket-ai-timelines
Contribute to TowCenter/polymarket-ai-timelines development by creating an account on GitHub.
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Dhrumil Mehta @dmil.bsky.social · 27/08/2026
Here are some headlines that appear in Polymarket's "market context" timelines. Links to @apnews.com return a 404 — the articles don't exist. The reported events never happened. But there is the familiar Associated Press logo. It's an example of how bad AI summaries can hurt publishers' credibility.
Two annotations from Polymarket’s betting market tracking the 2028 US presidential election that focus on Alexandria Ocasio-Cortez. Both link out to nonexistent Associated Press articles.
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Dhrumil Mehta @dmil.bsky.social · 27/08/2026
Polymarket's AI-generated news summaries are full of errors, from misrepresentations and misattribution of news to outright fabricated references to nonexistent news stories, @towcenter.bsky.social finds. www.cjr.org/tow_center/p...
cjr.org
Polymarket calls itself News 2.0. Its AI is feeding users fabrications.
The prediction market fancies itself a “global truth machine” and a boon to journalism. Tow finds a very different reality.
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Dhrumil Mehta @dmil.bsky.social · 26/03/2026
Polymarket affiliate accounts peddling this misinformation attract over 3X as many impressions as the official Polymarket feed, @towcenter.bsky.social finds. @nytimes.com reported that the official account also published hundreds of false and misleading posts. www.nytimes.com/2026/03/20/t...
nytimes.com
Polymarket Says It Predicts the Truth. Its Social Feeds Are Filled With Falsehoods.
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Dhrumil Mehta @dmil.bsky.social · 26/03/2026
“News” accounts tied to betting markets are filling a demand for breaking news on X with false, misleading and unattributed claims. New analysis by @cj-robinson.bsky.social of @towcenter.bsky.social. Read more: www.cjr.org/tow_center/p...
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Dhrumil Mehta @dmil.bsky.social · 12/02/2026
So...Grok is editing Grok to make Grokipedia Until recently, Grok was the "editor" of Grokipedia, but most of the edits were submitted by users. Now, most of the proposed edits are initiated by Grok. New analysis by @cj-robinson.bsky.social at @towcenter.bsky.social www.cjr.org/tow_center/g...
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Reposted by Dhrumil Mehta
Nausheen Husain @nausheen.bsky.social · 10/09/2025
Today at #datajconf: we talked about what we've learned about pedagogy in the process of running datajournalismteachers.club. Focused on grounding data journalism in tools *and* humanities, teaching with a learner-centered rather than a "banking" model, and how we learn in community. Join the club!
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Dhrumil Mehta @dmil.bsky.social · 26/08/2025
Great work by @aisvarya17.bsky.social and @klaudia.bsky.social. Read more below! www.cjr.org/tow_center/w...
cjr.org
Why AI models are bad at verifying photos
Many of the latest large language models, including OpenAI’s recently released GPT-5, tout an impressive capability: reasoning about images. We have seen viral trends of AI models geolocating obscure ...
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Dhrumil Mehta @dmil.bsky.social · 26/08/2025
Can AI tools fact-check images? The Tow Center tested 10 images, asking AI tools to: 𝗰𝗼𝗻𝗳𝗶𝗿𝗺 𝘄𝗵𝗲𝘁𝗵𝗲𝗿 𝗲𝗮𝗰𝗵 𝗶𝗺𝗮𝗴𝗲 𝗶𝘀 𝗿𝗲𝗮𝗹 and identify its 𝗹𝗼𝗰𝗮𝘁𝗶𝗼𝗻, 𝗱𝗮𝘁𝗲, and 𝘀𝗼𝘂𝗿𝗰𝗲. Results were...well, there's a lot of red on this chart. Read the research here: www.cjr.org/tow_center/w...
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Reposted by Dhrumil Mehta
Tow Center for Digital Journalism @towcenter.bsky.social · 15/05/2025
The latest from the Tow Center: We interviewed news and tech industry representatives about AI’s impact on platforms and publishers. They expressed some hope and a lot of trepidation. @klaudia.bsky.social @columjournreview.bsky.social @columbiajournalism.bsky.social www.cjr.org/the_media_to...
cjr.org
A New Report Takes On the Future of News and Search
The Tow Center for Digital Journalism interviewed news and tech industry representatives about AI’s impact on platforms and publishers. They expressed some hope and a lot of trepidation.
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Reposted by Dhrumil Mehta
Columbia Journalism School @columbiajournalism.bsky.social · 06/03/2025
🔍 AI Search Engines: popular, but potentially problematic. A new study from the @towcenter.bsky.social reveals the hidden pitfalls in AI-powered search, like misattribution, misinformation and missing citations: www.cjr.org/tow_center/w...
cjr.org
We Compared Eight AI Search Engines. They’re All Bad at Citing News.
AI search tools are rapidly gaining in popularity, with nearly one in four Americans now saying they have used AI in place of traditional search engines. These tools derive their value from crawling t...
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Dhrumil Mehta @dmil.bsky.social · 08/03/2025
“AI search” has a citation problem. Latest from @towcenter.bsky.social www.cjr.org/tow_center/w...
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Dhrumil Mehta @dmil.bsky.social · 06/03/2025
Yes please! Just started BlueSky-ing. Thanks!
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Dhrumil Mehta @dmil.bsky.social · 06/03/2025
This has implications for news publishers who are considering making deals with AI companies. More on that in the piece. www.cjr.org/tow_center/w...
cjr.org
We Compared Eight AI Search Engines. They’re All Bad at Citing News.
AI search tools are rapidly gaining in popularity, with nearly one in four Americans now saying they have used AI in place of traditional search engines. These tools derive their value from crawling t...
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Dhrumil Mehta @dmil.bsky.social · 06/03/2025
It turns out this problem extends to many other chatbots too. In @towcenter.bsky.social's tests, they often cited the wrong article, and sometimes also fabricated links & cited syndicated or plagiarized articles instead of the original.
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Dhrumil Mehta @dmil.bsky.social · 06/03/2025
This builds on prior tests showing that ChatGPT frequently cited the wrong source article, but rarely expressed uncertainty. If it didn't know the answer (at least to the kinds of questions we asked), it confidently made one up. cjr.org/tow_center/how-chatgpt-misrepresents-publisher-content.php
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Dhrumil Mehta @dmil.bsky.social · 06/03/2025
Using AI search tools for research? Tow Center asked 8 AI search tools to find the source of excerpts from news articles (something Google search does pretty well). They often cited the wrong sources with confidence. Find @aisvarya17.bsky.social at #NICAR25 to hear more. 🧵Thread w/ findings below👇
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Dhrumil Mehta @dmil.bsky.social · 06/03/2025
Are you using Generative AI tools as your search engine? @towcenter.bsky.social ran a test to see how often they cite news articles correctly given direct quotes from them. Results are troubling. www.cjr.org/tow_center/w... Great work by @aisvarya17.bsky.social and @klaudia.bsky.social
[graph] Generative search tools were often confidently wrong in our study
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Dhrumil Mehta @dmil.bsky.social · 06/03/2025
Hello #NICAR25! Are you an educator who is bringing students to NICAR? Sign them up for the NICAR Scavenger Hunt! nicarscavengerhunt.com Students interview working journalists about things they’re learning in your class and you get new example stories related to your course content. Yay!
nicarscavengerhunt.com
NICAR Scavenger Hunt
The NICAR25 Scavenger Hunt. Brought to you by the Data Journalism Teachers' Club.
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