Usernames are publicly visible.
So, unless you intend to announce your identity, we recommend that you
choose a username that’s not personally identifiable. And hey, keep it
classy, because the Internet remembers.
Usernames must be alphanumeric and at least three characters long.
Your email address will not be made public.
We’ll only use it for account maintenance, important service
announcements, and the occasional (brief!) newsletter (but only if you tell
us you want to get it).