Someone told me the same thing in Israel. Almost overnight there was a Facebook explosion and everyone they knew was on Facebook. I think it just happened in Turkey too. I started finding all my old high school friends. They appeared and spread like a very efficient virus. I will probably soon have almost all in my class as friends. My college class is slower to adopt.
Cool!
I am not yet into all the other gimmicks like the wall etc. but I started to really like it.