If nothing else, wasting time on Facebook provides you with a legally-binding criminal-defense alibi:

[Rodney Bradford's] defense lawyer, Robert Reuland, told a Brooklyn assistant district attorney, Lindsay Gerdes, about the Facebook entry, which was made at the time of the robbery. The district attorney subpoenaed Facebook to verify that the words had been typed from a computer at an apartment at 71 West 118th Street in Manhattan, the home of Mr. Bradford’s father. When that was confirmed, the charges were dropped.

“This is the first case that I’m aware of in which a Facebook update has been used as alibi evidence,” said John G. Browning, a lawyer in Dallas who studies social networking and the law. “We are going to see more of that because of how prevalent social networking has become.”

Not that visitor logs can’t be spoofed, or anything. I’m sure the law will catch up eventually.