I experienced some cognitive dissonance between "privately" and the Facebook/Google login buttons. Don't get me wrong, maybe it's always a temporary token and there's a plausible distinction between anonymity and privacy.

But why not just a unique URL via cryptographic hash from a pass phrase?

Good luck.

It's just a login URL for Facebook/Google to provide you speed while logging into Inert Space. We don't share anything neither we grab your contacts initially while logging in. The buttons are just there to sign in to the system. We are using PassportJS on our server to facilitate this. So it's an OAuth 2 authentication that's happening here. Did I miss anything?

I understand what OAuth does...more or less. I would predict that my sister does not. "Google" and "Facebook" don't connote privacy. They imply that if a person types "shoes", the next four hours of browsing will be full of shoe ads. That's the dissonance.

Why have a login at all?

Login is clearly aligned with privacy when "privacy" is mostly defined in terms of authorization. Login is less aligned with privacy when it is defined in terms of anonymity.

Google+ and Facebook are both services built on removing anonymity.

I completely agree with you. Will try to revert back to email/password based login.

Cannot remove login as then the features of social network will make no sense. Thanks for the feedback.