I do mostly because of how much of the information about people through pictures and videos of them on Facebook, Twitter, YouTube and Instagram (and previously MySpace) that can be viewed and shared and commented on.Your relationships with your friends and family members become nonexistent because of it, strangers think they know who you are when they don't know you at all, they just like what they see on your page. It could be used as a way to manipulate people into thinking you are the person you claim to be by using fake names and locations, lying about who your friends and family members are, or even what you look like etc.