I don't want to use gmail because i don't want to have a global online identity. But it depends on what you see as the primary use case (corporate? technical? c

I don't want to use gmail because i don't want to have a global online identity. But it depends on what you see as the primary use case (corporate? technical? casual?). Optional gmail is fine. If it's all private then maybe i'd be OK with it, but it doesn't seem like this is your long-term goal. I'm not certain how the security would work with what you are describing, i guess it requires you to be signed in to gmail constantly, but password-less option sounds good. Friction must be extremely low. Outside of gmail, make sign up just username /password.. avoid the sign-up email if you can. Think about if you really need someones email. You will of course have to make this 100% perfect and have a lot of great ideas (but those can grow organically later) to get very far with this, IMO, but i wish you luck.