Your next SMS will probably be around longer, and remain more legible, than your tombstone. For, unlike your tombstone or even your mortal coil, your texts may be worth something.
On Facebook, your past comes into your present when someone from your second grade class suddenly pops up to send you a message, and your future is being manipulated by what Facebook knows to put in front of you next.
It's not that MySpace lost and Facebook won. It's that MySpace won first, and Facebook won next. They'll go down in the same order.