Scammers have invaded every selling place, from personal experience, but I've had very few on CL.
Then again, very few responses to my CL ads even on smokin' deals.
Local guys seem to think I should deliver the parts or give 'em away.
A lot of the FB ads seem to invite the armchair experts who haven't bought anything since the 1970s.
So I've resisted doing much there because I hate wasting my time.
I prefer to buy/sell here; I've had a couple guys flake out, but 95% of the time things go well.