Just ignore all the retards posting stupid crap/comments on FB, there's a lot of car related content that's worth the trouble of signing up. The worst offender is FB itself, the amount of unrelated stuff that comes up on the feed can be annoying, they blame it on algorithms, I think it's set up that way to benefit advertisers and FB directly. Marketplace is a good place to look for things in general, scammers galore though, both on marketplace and car groups, so caution is necessary, which goes without saying. Sharing your personal matters, photos, etc. is a bad idea, as is discussing politics, depending on which side of the fence you're on and where you live, as big brother and arseholes alike will use it against you given the chance.