[GitHub Bug #1093] Twitter connect uses dummy email firstname.lastname@example.org!!!
[GitHub Bug #1093]
screen_name's may possibly be duplicated, possibly if user deletes their account and evil friend then impersonates them.
Also not being a real email it messes up notifications, preferences, etc.
You can't get email from twitter credentials. Possible solution is to store twitter ids in a col, get email if needed, compare.