Your dichotomy is as silly as Arrington's; narrative arcs based on what turns out to not even be based on real life events, but actually the
absence of knowledge of events because you weren't paying attention.
As far as I can tell they both still require at least pseudo real names, the absence of which will get you flagged. Facebook just had a thing in the news like 6 months ago where they were demanding government IDs from people to unfreeze their accounts.
Here's the help page:
> We require everyone using Facebook to use their real name and birthday. This way, you always know who you're connecting with. When we discover accounts that look fake or like they’re using fake information, we ask the owner to confirm that they are who they say they are.
https://www.facebook.com/help/385569904840341
I avoid ever using Facebook login, but I think this new anonymous login is great, will be a boon to users (though not offering those users privacy from facebook itself, as others are focusing on) and I'd like to see a lot more of that in Android itself (especially those per-function permissions).