[OoTheNigerian]

I get where you are coming from but I strongly thing you should test it.

So if for instance, the user enters his email and is using a persona identity provider, e.g Yahoo It could just give a message 'Sweet, why don't you login with Yahoo " or create an account.

If the user has a Persona account already, once the email is put, it could say "Perfect! You are logged in"

If the user is using persona for the first time and does not user an identity provider, it could just bring a persona form.

Of course, for each instance, you could have a tiny "powered by persona" somewhere. With a bit of thinking it can be refined.

I do not see any reason why a user will want to start thinking about what persona is. They will just use an alternative (Facebook). What persona should be aiming for should be to become "login with email" and not another 3-in-one brand called persona.