I may be the odd exception but I just came out and left my Facebook page be, just changed my name and gender. The pictures don't bother me much, as I hardly recognise the old me from the new me after all the weight loss, T effects, and fresh hairstyles. When I enter college in the fall I might make a group of friends (how you can sort them and stuff into like, "best friends" and such) and see if I can't only allow people that knew me pre-transition to view old posts, pics, etc, so that way if I want to go stealth to some people, I have the option. I guess it's really just dependent on how you view your past, as a learning experience, past life, or as something to hide, all of which I can understand.