I found out that my sister broke up with her last boyfriend because Facebook told me. Not a Facebook friend, the Web site itself. She had linked to him as her "relationship," so when you went to her profile page, it said that she was "in a relationship with . . . " that guy. Then they broke up. Being children of a digital age, they decided to tell Facebook before they told actual humans. They both changed their relationship status to "single," and Facebook sent out a message to all of their friends. The message said they were "no longer in a relationship." Facebook is a bit too smart for its own good. It saw their relationship status change and put two and two together. Or rather, it subtracted from two, and came up with zero.