Here's another example of how someone's Facebook profile was used against them (First example here).

"If you are alleging that, as a result of an accident, you have not been able to enjoy life the same way and there is a photo taken after the accident showing you skiing or exercising … that could be relevant," the civil litigation and intellectual property lawyer said in an interview yesterday.

Well duh. If there are cases where people's personal diaries have been subpoenaed, I guarantee you an online record like Facebook is fair game.

Whether or not the officer in question really did use excessive force, the main point here is that the things you write about online can come back to haunt you in the most unexpected ways.

Officer Ettienne said he is now being careful to mask his identity on the Web and that he has curbed his tongue because of the acquittal. "I feel it's partially my fault, he said. It paints a picture of a person who could be overly aggressive. You put that together, it's reasonable doubt in anybody's mind."

Even your "private" Facebook or Myspace account isn't so private under the force of a subpoena.