Do people add people they just see at the gym on facebook?

Anonymous
I have a few people I don't recognise that look like there into finess send me friend requests on facebook.
This is after joining a local gym fairly recently. I'm not even sure how they knew my name I don't remember speaking to any of them and you don't really use each others names much if at all when you talk to someone or at least I don't.
Do people add people they just see at the gym on facebook?
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