Kind of, but you need to identify yourself with a facebook account that is linked to your name. Probably not the best idea if you are trying to form a community like r/piracy or r/watches where you could remain unidentified
It is, and it’s even more popular than reddit in my local communities. The problem is the lack of anonymity
Do you mind to prove some example of communities popular? Sorry but I haven't had facebook since 2016 and I literally have no idea what is going on with it.
I don't live in the US. We have groups for uni, the tech sector (in general, kind of like /r/programming in a way), ML&DL, dating, sales (alongside Facebook Marketplace). We also have groups for towns and neighborhoods as the prime way for the locals to communicate. It is de-facto reddit here