Every once in a while, I'll find a username in the format of user{number}, where {number} is an integer.

What do these users mean? Are they guests, or still to-be-approved accounts?

  • You had a name like that before you changed it :P – Matthew Read Jan 7 '13 at 5:02
  • @MatthewRead I think a username was required back then, when there was only SO, and OpenID wasn't an option yet. – geffchang Jan 7 '13 at 6:10
  • Do accounts get approved? – Liam W Jan 7 '13 at 18:02

A default username is generated for anyone who posts (registered or unregistered) of the form user<number>, where the number is simply an auto-incremented integer. Anyone who chooses not to create some kind of username for themselves (which is optional) will be assigned one of these automatically.

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