Is a facebook a place where you are friends with people you have no clue who they are?

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I've read this post before and it's says something like: facebook, a place where you're friends with people you have no idea who they are". Today I was just looking at some people's facebook (people that I know) and they are friends with like people they totally don't even talk to, and some are friends with I doubt they even know who they are... it's like, people are friends with people that are in totally two different worlds. Like fro example, this popular person is friends with some pretty unknown kid and I doubt they even know each other at all. I doubt they've even seen this person at school. Seems like everyone is like this Just randomly friending everyone....It's like everyone is friends with everyone.... do people just like randomly accept friends requests? I don't have a facebook because I don't like it, so I don't know much about this whole facebook thing.... it's so weird..... Lol are you people the same?
Do people just friend everyone that goes to teh same school as them? lol it's so strange....I don't get it..