I have no idea whatsoever what it is. But I had a request from an old friend to be on her page, it said click if you give permission, then it said enter a log in and password. I think I must have joined somehow because I have had about 50 requests from people now and when I say I am not in it they say "yes you are, I found you in a search". I am only in my early 30s but feel like a sad oldie, I really don't understand how it works...they didn't have facebook in my day...