We're testing having only Facebook login in our iPhone app, iQila (www.iqila.com) and the number of logins fell about 80-90%! Now we are going back to FB + Twi

We're testing having only Facebook login in our iPhone app, iQila (www.iqila.com) and the number of logins fell about 80-90%! Now we are going back to FB + Twitter + native but making our lazy login even lazier and I believe that has the most bank for the buck.