We have been using facebook connect for a while. But we are not glad with the small avatars and it we feel not good about that. So we want to delete/deactivate it.

BUT....

When we deactivate it, people who are registered with facebook can't login anymore. (logical) - But in that case we 'lock' their profiles because they can't use them anymore but they still exist.. That's not nice for them.

Is there a easy way to delete all the 'facebook-profiles' as well? Or turn them into a normal account so they can login without facebook?

Thanks,