[kijin]

My problem is with the "email provider" part. In the real world, it just means Google, Yahoo, Microsoft, and handful of firms (like Rackspace) that provide hosted email solutions for a fee. You might call it "decentralized", but I'd call it "mostly centralized".

[StavrosK]

Eh, so what? The only thing your provider knows is that you're trying to authenticate somewhere, but not where. It's hardly bad.

[lucian1900]

It's still way, way better than "Log in with Facebook" and has the potential to get even better over time.

[kijin]

Of course it is, but it still ain't anything close to optimal.