I don't know why anyone would want to attach their name and everything to stuff they are selling.
(I'm not saying it always does, or that it cannot be exploited, or that it won't eventually be scammed beyond usefulness, etc; but it's not always a clear negative today).
Craigslist attracted drug dealers, hookers and fences for a long time. People like that figure out that it’s easier to scam a buyer than do the honest work of stealing shit to sell.
That said, my personal experience with Facebook has been the same. It’s trivial to spot bot/spam accounts, and I typically end up with a high degree of confidence that the identity is real.