UNDATED - They say it begins with innocent curiosity. Things like checking Facebook status, or a simple poke. "I probably look up at least one of my ex's like once a month."
A recent survey showed 20 percent of divorces involve Facebook, and 80 percent of divorce lawyers reported a spike in the number of cases that use social media for evidence.
Tales of Facebook heartbreak are popping up across the web. It's so common there's a website dedicated to Facebook cheating. The founder says he started the site after his now ex-wife had an affair with an old flame she re-ignited on Facebook.
Terry Real, a marriage counselor, believes that Facebook can provide a sort of fantasy for a cheating spouse. "There is nothing more seductive than the "one that got away" fantasy is always better than someone who's up to her eyeballs in bills and diapers."