Breakup Notifier Emails You When People You're Stalking On Facebook Change Their Relationships

"Zuckerberg sometimes amused himself by conducting experiments. For instance, he concluded that by examining friend relationships and communications patterns he could determine with about 33 percent accuracy who a user was going to be in a relationship with a week from now. To deduce this he studied who was looking which profiles, who your friends were friends with, and who was newly single, among other indicators." -- David Kirkpatrick's The Facebook Effect