A June 2010 survey of 1,000 Facebook users -- 70% of whom were male -- found that 25% had been "dumped" via Facebook (via their significant other updating his or her relationship status).

Twenty-one percent of those surveyed said they would end a relationship by changing their Facebook relationship statuses to "single." While worrisome, the survey does show the majority of people do not split up via Facebook.

PD: This photo is from a genuine FB status.