(NEWSER) – Ah, Facebook, that repository for high school friends, college friends, friends of friends, people you wish you'd never met ... and the dude who robbed you the other day? Police in Washington state say that a woman was sitting at a ferry terminal with headphones on when a guy knocked her on the head from behind, grabbed her iPod and purse, and took off. Police say the woman didn't recognize the man, but the AP reports that she saw a triangle tattoo on his neck. Lo and behold, the next day she received a friend request from—you guessed it—a guy with a triangle neck tattoo. Twenty-eight-year-old Riley Allen Mullins, who police traced to the Facebook account and tattoo in question, has been charged with second-degree robbery.