On the last point... in general, a lot of sites, in order to let users participate only really care about having a name and email address or phone for contact needs. Most don't really even care about that. Why not let any number of other systems take care of that. For that matter, they also handle validation.
I'd rather let FB/Google/Twitter and now Apple deal with verification details, and let them participate in a site. It also means, on doesn't have to deal with persisting or dealing with passwords (that can be breached) etc.
Of course, I'm still inclined to allow local/passworded accounts and ensure salt+hashing of passphrases, etc. It's just in a lot of ways much easier as a user.
Depending on the site, I'd often prefer Twitter (until my short account ban/lock, which made life more difficult for a few days... FYI, don't rile up the communists too much).
I'd rather let FB/Google/Twitter and now Apple deal with verification details, and let them participate in a site. It also means, on doesn't have to deal with persisting or dealing with passwords (that can be breached) etc.
Of course, I'm still inclined to allow local/passworded accounts and ensure salt+hashing of passphrases, etc. It's just in a lot of ways much easier as a user.
Depending on the site, I'd often prefer Twitter (until my short account ban/lock, which made life more difficult for a few days... FYI, don't rile up the communists too much).