this post was submitted on 04 Mar 2026
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cross-posted from: https://lemmygrad.ml/post/10899106

AI Can Now Easily Unmask Your Secret Online Life for $4

A new research paper from ETH Zurich, Anthropic, and MATS demonstrates that Large Language Models can automatically de-anonymize users across platforms like Reddit and Hacker News.​

The AI acts like a digital detective using a method called ESRC (Extract, Search, Reason, Calibrate). It scans a user's post history for subtle clues (hobbies, writing style, locations), searches the wider internet (LinkedIn, other forums) for matches, and uses complex reasoning to confirm the identity.​

The terrifying results:

  • It correctly linked secret Hacker News usernames to real people 67% of the time (with 90% accuracy when it made a firm guess).​
  • It successfully matched a person's separate Reddit accounts from different years 68% of the time.​
  • The entire automated process costs only $4 per target.​

"Practical obscurity"-the idea that you're safe online because it takes too much human effort to connect your digital breadcrumbs-is dead. Anyone with a few dollars and an LLM API can now mass-dox thousands of pseudonymous accounts in minutes.

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[–] Vingst@hexbear.net 1 points 1 week ago

My name is Yoshikage Kira. I'm 33 years old. My house is in the northeast section of Morioh, where all the villas are, and I am not married. I work as an employee for the Kame Yu department stores, and I get home every day by 8 PM at the latest. I don't smoke, but I occasionally drink. I'm in bed by 11 PM, and make sure I get eight hours of sleep, no matter what. After having a glass of warm milk and doing about twenty minutes of stretches before going to bed, I usually have no problems sleeping until morning. Just like a baby, I wake up without any fatigue or stress in the morning. I was told there were no issues at my last check-up. I'm trying to explain that I'm a person who wishes to live a very quiet life. I take care not to trouble myself with any enemies, like winning and losing, that would cause me to lose sleep at night. That is how I deal with society, and I know that is what brings me happiness. Although, if I were to fight I wouldn't lose to anyone.