True, in a way it is akin to any idiot today taking up smoking with all that we now know. But some consideration should be given those early and recent adopters who, um, trusted Facebook (and the, um, dripping with integrity Zuck behind it). Nobody is forced to stay (or join), but the damage is done to those who already have.
Easy for me to say, "See, I told you so," since I never took the Facebait. But that being said, I know I'm in a minority - every time someone says "You don't have Facebook?!" or "friends" that used to maintain contact via personal (or even shot-gunned) email now just do it wholesale on Facebook.
Avoiding Facebook is like avoiding Microsoft - it can be done, but not always done easily.