I'd like to think I could trust Bitcointalk against anything but legal subpoenas within proper jurisdiction, but maybe not?
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About privacy:
It's possible to use bitcointalk.org without submitting any personal info. Use Tor + a throwaway email + a new pseudonym, etc. If you care about preventing personal information from being collected on bitcointalk.org, then preventing this collection is your responsibility.
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At our sole discretion, we may (noncommercially) share or extend retention on any of a specific user's userdata even without law-enforcement involvement. This is very rare.