Q:

Where do all these 'user123456' accounts come from?

Being a read-only user for a long time, I hadn't noticed this before...
But, switching to 'registered user' and reviewing all these questions asked - I wonder, where all these newbie accounts (i.e. 1-10 rep. at most), named with pattern user[\d]{6} (i.e. user+6 digits) comes from?
Especially most of questions asked by such accounts are about assistance in some homework task (being very much programming newbie issues).
The only thing that comes to my mind is that Stack Overflow (while this seems to apply to other forks of it) has launched some referral / marketing program, or suffers some security hole.

A:

The answer to this question was explained in details by the very first commenter that got a look at it (this wasn't not verified by me, though I don't have any reason to doubt it):
Stack Overflow registration procedure accepts not entering any local "nickname", assigning something simple as 'user' + {registration_id}...
Thereafter any newborn accounts hadn't bothered to adjust theirs registration information ends with all these infamous 'user123456' nickname.
(The "trivial questions" part is of the initial question is definitely obvious from the very start, taken the date of the question was asked - the fall (mid-October) - school/college season is on, thus too active students are on the go at the time of the question.)

