And now keychain is on the app/play store, there's another plugin for a browser that you don't use on any other conventional social media site where we're trying to get people from.
If the log-in can be made identical to that then that's a big step in my opinion. Having everything working under the hood is one idea. For example when you sign up with FB, you get automatic account HIVE account creation with all the relevant keys somehow integrated in but 2FA is a must for making wallet transfers and important things like that. So something like:
Logging in with FB/Google = posting key
2FA = active key
Forgot Your Password = account recovery/owner key
Not sure how the Master Key would work, maybe it's just the password emailed over on sign-up with instructions on how to keep it in a safe place?