: You can check if your phone number or email was part of this specific Facebook leak at Have I Been Pwned.

: Smaller subsets like "500k" or "250k" users are often used in academic settings for social network analysis, such as studying friendship relations, events, and group interactions. Safety and Verification

: In past major breaches, such as the Cambridge Analytica incident, Facebook has sent direct notifications to the news feeds of affected users.

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If you are looking for this file to see if your own data was compromised, it is safer to use reputable breach verification services rather than downloading compressed files from unknown sources.

Facebook User Data Breach: What Happened, Impact, and Lessons