Do any of us really know EVERYBODY on our facebook friend list?

Not all,maybe about 75% only of all my facebook friends that I know personally. Though,I do add people whom I knew from my friends,not those whom I really don't know at all. We met during our elementary days,and I'm happy to see you again. ^_^

I don't think everyone knows all of their facebook friends as some people add friends of friends and others that request friendship but they do not know who they are but add them anyway. Myself i only add people or accept requests that i know who they are otherwise whats the point in having a friends list if they are not actually your friends.

I know everyone on my facebook friends list. I wouldn't just randomly add people I don't know. There's no point in that.

I honestly know everyone of my Facebook friends. I do not add people who I do not know, so that is probably why.