Is cragslist usable where you live? Last 5 times I've gone there looking it's 98% dealers in every category, especially the non-dealer ones.
If I want to buy from a used ______ shop, I wouldn't be on Craigslist.
And in certain categories, your legitimate ad (anything Apple in particular) will get insta-flagged because it's competition. And then you'll get a call from the likely flagger, who's a dealer trying to score a cheap deal and resell. They post the same ad 5-10 times a day, so there's no hope in weeding them out.
Craigslist evidently doesn't really care, so I have to wonder if thefacebook (tfb) can do a better job. All the startup reselling apps are filled with soiled couches and old gym bags. They're like going to a yard sale after all the good stuff is gone. This is in the US southeast, so I'm sure it's different on the coasts.
Regarding tfb buying tbh... the antitrust laws are in dire need of reinterpretation from the Supreme Court whether it's in this case or something substantial it doesn't matter.