nope they didnt said anything and i have everyone which i like in my friendlist (around 200 people) and many of them know me with a shaved head (but with concealer) and also some people who know me since my childhood and during the time where i was bald like Mr proper (5 years ago).

They mainly think i went from shaved to long hair but some of them of course know that i have a hair problem (I am normaly norwood 5):
http://www.abload.de/image.php?img=xssdsd2i7ht.jpg

My close friends and my family know that i wear, but mainly just because i told them. People dont care much about your hair, so dont think about other people. If you like it then do it.

If the transition is obvious just show confidence and nobody will make fun of you. But of course you dont need to make it obvious, so just deleate the old photos.