I propose we make Username the first field in the sign up forms, because that is the most important field in the mind of the user (i.e. registering a username for themself).
The email field is currently not validated in the facebook sign up form (below). We had a user who I assume typed their preferred username into the first field and probably never even looked at the labels or other options. I think it’s a fair assumption, but it probably never comes up for others because the validation stops you from submitting the form.
Continuing the discussion from Why showing blank email box during Facebook sign up?: