[qup]

In some regions (mine) Craigslist never took off, and now is a ghost town.

I would estimate it gets less than 1% of the traffic of FB Marketplace, in terms of number of vehicles posted. And nearly all of them are car lots, not individuals.

[nothercastle]

In Seattle FB marketplace for cars is almost entirely dealer spam and totally useless. It totally depends on location.

Craigslist died for cars because you have to pay to post now