I walked up to this girl who was checking her Facebook photos, and I innocently asked, "What's Facebook?" She kindly started going off explaining that it was a site, blah blah blah. I felt bad letting her continue to embarrass herself, so I interrupted her and told her I was just kidding. Fortunately, I got a big laugh out of her about it and not a "Bloody Americans" remark.
But seriously, EVERYONE is on Facebook. Everywhere we go, there are multiple people on Facebook at the same time either writing messages, chatting, etc. Here is a picture to prove it. Every single person is on Facebook, and there was one more that didn't fit in the shot.