Scary!!!! But only if I put things there that I would regret later, I guess. I can't see how they would "really" benefit from my sky-diving pics or whatever.
Now, if I were stupid, and posted some "high risk" photos... then I can imagine that coming back to haunt me one day.
I'll just be more careful about the pics I put up there from now on. No more of my kids or the kids I care for... even to show friends.