Theymos of the Bitcoin Talk forum today revealed he recently received a subpoena to which he satisfied a request for posts made by current and ex-employees of BFL in addition to the content of their private messages.
I recently received a subpoena related to a case against BFL (Case No. 14-CV-2159-KHV-JPO). I had to release all database info on a few employees/ex-employees of BFL (including their PMs), plus a complete copy of every thread in which anyone mentioned BFL or in which a BFL employee participated. (It was a huge hassle to put all of this info together.) The subpoena originally demanded all PMs that even mentioned BFL, which is ridiculous, but I managed to get this part eliminated.
If a PM of yours was released due to this, then I already sent you a PM about it.
I don't think that I'm going to send PMs about deleted posts that were released. 3196 users had deleted posts released, and I don't really want to send that many PMs when almost no one would care. I feel like people should have basically no expectation of privacy for something that they posted publicly anyway.
I also released all "report to moderator" reports involving or mentioning BFL. I don't think that these are very sensitive, so I'm not going to send out PMs about these.
This is not the first time that Theymos has complied with a request for further information on users of his forum. In December of 2014, he revealed he had turned over deleted posts made in the "A Heroin Store" thread to the United States in relation to the Ross Ulbricht case.
Today's announcement is surely a cause for concern for anyone who was foolish enough to believe private messages sent and received on Bitcoin Talk were actually private.