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What is Stack Overflow’s business model?

I am wondering without significant donors and no advertisement policy on any of the Stack Overflow or it's siblings how this big website with large database and many servers is maintained?

  • I did a research but not able to find out.Thanks for the answer. – Uppi Dec 13 '12 at 21:28
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    I should note also that (1) Stack Overflow is not a non-profit; it is run by Stack Exhange, Inc. and (2) there are advertisements on Stack Overflow. – waiwai933 Dec 14 '12 at 8:12
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    Companies have to pay to post on Careers 2.0 – inspectorG4dget Dec 14 '12 at 8:13