When you have a restraining order out against you, you need to be careful when playing around on social networks. A 37-year-old British man had been given a no-contact order after harassing his wife with text messages and phone calls. When he joined Facebook, he checked the box that would invite his entire address book to join as well. In Silicon Valley, that's just an annoying social faux pas. But for him, it was a violation of his no-contact rule. He received ten days in jail, but served only seven after his lawyer petitioned the court that he had been "confused" by Facebook's sign-in procedures. Good thing he didn't poke her.

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