True of most transactions I'd think. You meet in person, they can see your license plate. Communicate via text, they have your number. Selling something larger than can fit in your car? They come to your house. Many people won't buy something of any real value without some degree of accountability.

I think the surface area of a world where transactions are 100% anonymous is quite small.

... which is why I also included (6), which you conveniently left off your blockquote.

Ending harassment on Facebook is as easy as blocking them. Done.

But they seem to show your full name and public Facebook picture, which opens you up to all kinds of potential real-world harassment that doesn't exist on the (if you're smart) fully anonymous Craigslist. Such as showing up to your workplace to demand their money back, or finding your contact information via a Google search.

> Ending harassment on Facebook

Yes but with real information there is the external communication. I can search for names, addresses, phone numbers without FB.

It is naive to assume FB controls are valid in real life when personal info is available.

Facebook has pretty good blocking controls built in already. Better, I'd say, than email and phone providers have.

Not really. Dismissing someone from your attention on Facebook is trivial.

But dismissing yourself from someone else's attention isn't.

Very true, but couldn't you say that about any p2p marketplace/selling website (like Craigslist)? If someone's the harass-y type, I doubt they'd be bound by platform

They sure are bound by the amount of information you give them.

On Facebook they tend to have your picture, full legal name, social circles, place of work and where you live from the start.

I know plenty of people who use online markets pseudonomously (and also break fb policy on that), and meet in public places for the money/item exchange. It's normal here to only share first names in a trade.