Facebook recently introduced an , which lets people share their status as an organ donor on their Facebook Timeline. At the moment, all it does is let people .  But according to Donate Life America, , 6000 enrolled to donate their organs the day the initiative launched -- compared to 400 signups it would see on a normal day. 

Never mind organ donation; it's not too farfetched to see Facebook leveraging its massive network when it comes to matching up bone marrow or kidney donors with recipients.

Facebook has also forayed into health-related fields in the past -- in December, for example, the social to offer online support for potentially suicidal users. In this initiative, family and friends of suicidal Facebook users can "report" public suicidal comments to Facebook, and the person who made the comment will be offered suicide prevention support.

In other words, Facebook is already pushing its way into people's most private parts of their lives -- their health -- and, it appears, succeeding.