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> would it not be better for other users to see a real human thoughts instead of comments of some anonymous nickname?

I think that's a false premise. My thoughts are no less human because of coming from a nickname. While I'd agree there's a tradeoff (some people will be total assholes) on the balancing side you actually get far more honest (and 'human') thoughts from me because I'm pseudonymous than you do if you ask me to broadcast publicly.

Pseudonymity is good and gives user more confident when they face a wider bigger social base.

Keep it real is more effective with small circles & friends

We're all anonymous nicknames here, and it does work well

That said, it's a lot easier to attract trolls with nicknames than with their real faces...

Facebook login provides the holy grail of that: a (likely) real user behind an anonymous nickname. You can also judge the user by how many friends they have on FB, in terms of whether they're likely to be a real person.

That said, some developers hate using FB for anything, and some users hate connecting with their FB accounts.