The Facebook one is interesting, as I've all but stopped using it for any of the friend/family stuff but it's used a lot by hobby and special interest groups, especially local ones where something like a Reddit community is too dispersed.
FFVII memory time! I remember borrowing it from a friend in school, then chatting to him a day or so later about how it was interesting how the entire planet was covered in a city above it. I hadn't left Midgar at that point so when he told me it was just a city and you eventually go out into a bigger world I was so excited.
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