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Stack Overflow has just surpassed 1000000 users user ids. Yet if you go to the /users page, there are "only" 15655 pages. 36 users a page, that's "only" 563,580 users.

Since unregistered users also have their unique ids but don't show up in the /users pages, I'll assume there is difference there. But are about half of our members unregistered?

And there are users who are outright deleted. What gives? Does SO purge its users after some period of inactivity?

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I think they only show users with either at least 50 or 100 rep. –  Adel Oct 17 '11 at 23:24
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@Adel Clearly that's not the case. If you go to the last page, you'll see users with 1 rep. –  NullUserException อ_อ Oct 17 '11 at 23:25

2 Answers 2

up vote 13 down vote accepted
Select Count(*) From Users

Stack Overflow has 829,905 users at the moment (a few more by the time I submit this), then take away one for Community, here's a breakdown:

  • Registered: 564,682
  • Unregistered: 265,189
  • Moderator: 32

And there are users who are outright deleted. What gives?

We deal with spam like everyone else...and users who ask to have their accounts deleted.

Does SO purge its users after some period of inactivity?

Yes, an automated task cleans out accounts with literally no activity after a certain age.

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First off, unregistered (cookie-based) accounts don't show up on the users page. So there's a big chunk of users who won't "count".

Then, accounts are deleted automatically if they aren't active. (See link and blog post for definition of "active"). So those won't show up either.

Finally, there are accounts that are merged, and accounts that are simply deleted for other reasons (user asked for account to be deleted, spammer accounts, etc.)

See also

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Additionally, going to stackexchange.com/sites will show a count of registered and unregistered users per site. –  Mat Oct 18 '11 at 5:44

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