Never did facebook or other "social networking" sites other than Kink oriented ones. Even there, I don't use my name. It would take some effort, but it's probably not fool-proof. My blog also had too much personal info, again if someone took a lot of time they could probably figure out who I was.
Stupid, but yeah, there is an aspect of ego that wants us "known". All I can do at this point is make things un-worth the effort it would take.