I don't know anybody on here personally but I've made some friends here who I chat with all the time. There are people from all over the world so it's kind of cool to talk to people from other countries.
as long as they share similar interests, they can talk as if they know each other really well. Some use this as a way to find dates, which is not a very good or safe idea, but there are some that know each other very well. I know nobody on here however, I just go on this site as more of a way to have fun and find answers fast.
Yes, some of us know each other, we text, email and chat on the phone sometimes. It's truly wonderful to make a connection with people you really like. There are many fun quick witted friends on here. But, we also protect each others private info like it was our own.