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Dhrumil Mehta

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

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

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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 · 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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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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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
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
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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