The current options make pretty ugly usernames. Allowing an admin to set something along the lines of a - or a _ between the first and last with the capitalization as specified by the user and then having an admin defined suffix indicating the registration source would be more elegant. ie 01 through 09 for FB instead of the obvious _fb.
I think John_Smith01 is much prettier and user friendly than john.smith_fb
The difference between first.last option and your examples would be the capitalization and separator.
There is no "_fb" identifier on the username when the 'Auto Username Prefix' option is set to first.last, firlas, or email.
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