Prostitution in California is a misdemeanor punishable by up to $1000 fine and/or 6 months in county jail. Most arrests don't result in much more than a small fine and the woman changing her stage name. So in general, the police aren't really interested in chasing down leads via Backpage, there isn't much upside in it except during the yearly "tough on crime" sweeps. Arresting the CEO of a major company on the other hand will keep your name in the news for months. And when you are running for Senator that's a good thing. Maybe. I'm re-evaluating my support for Kamala Harris based on this stunt.
No anonymous comments don't need email addresses. I'd guess they are hashing the IP address instead of the email address in those cases.
I've always thought that the Facebook privacy flap is overblown. I go on the assumption that anything I put on the Internet may be publicly viewable or searchable, now or in the future. Once Google started indexing newsgroups I'm amazed at the crap that shows up associated with my name. Of course I said it then, so I stand behind it. If you don't want just anyone seeing your naked body, don't post the damn pictures on the Internet. Or put less bluntly, assume that when Facebook goes out of business the buyers will just make everything available and don't post anything that you don't want the world to see or know.
Why do none of these articles say what file sharing program was at fault. I'm guessing LimeWire/Bearshare and the user forgot to limit the sharing directories to their music folders. NBC Nightly News had a similar warning Sunday night about tax returns being stolen via file sharing programs, but again, no details as to the program or how to prevent it from happening.
Snopes
And yet another slander against Snopes. Anyone who spends more than 30 seconds on snopes.com knows that they don't accept advertising of any kind. But in this year of believing that facts don't matter any site that promotes facts that go against what the base believes is suspect and biased.