I didn't terribly mind having to use Twitter for signup.
As soon as you asked for my email AS WELL, I could no longer be bothered to click through - the only value of 3rd-party login is not having to give you my email address.
I have no idea why this is required. Why add friction to posting? Email + password + confirm password seems like the best idea, with Twitter as a separate option.
As soon as you asked for my email AS WELL, I could no longer be bothered to click through - the only value of 3rd-party login is not having to give you my email address.