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X's Open-Source Algorithm Can Unmask Anonymous Users, Researcher Warns

X's open-sourced algorithm encodes detailed user behaviors into fingerprints enabling the de-anonymization of alt accounts and cross-platform identity mapping, raising privacy concerns.

Summary
AN OSINT researcher discovered that X's open-sourced recommendation algorithm includes a "User Action Sequence" feature that creates detailed behavioral fingerprints from millisecond-level scroll patterns, blocking habits, and interation timing.

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TechCrunch broke the news in United States on Tuesday, January 20, 2026.
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