I use face book and have had no problems with it. Im very choosy who i "friend" I dont "friend" teen agers (Im an adult) unless they are the children of my friends and family. those teens that I do have befriended have great parents that monitor their kids pages and dont allow online bullying / fighting, swearing and all that other stuff that comes with being a teen.

I love facebook because they have all kinds of security options and settings. I can set things so that I only see my co workers status, in another "list" I can set it so that I only see my friends, in another "list" I only see the posts pertaining to those playing the same games that I am playing...

facebook also has ways to delete / hide any postings which I find to be annoying, inappropriate or offending.