Maybe it's debatable now whose property it is. But I'd imagine many people think it's their own property that they allow Facebook to hold and control on their

Maybe it's debatable now whose property it is. But I'd imagine many people think it's their own property that they allow Facebook to hold and control on their behalf. The users still retain all the ownership rights associated with that contact list... or so they hope. It's like buying stocks. Often times a brokerage will hold ownership of stocks that clients buy, on behalf of the client. Doesn't mean the brokerage can do just whatever it wants with my stocks.