In the case of Stack Overflow/Stack Exchange, see Jeff Atwood's (slightly dated - IIRC job candidates are no longer charged) answer to "What is Stack Overflow's

In the case of Stack Overflow/Stack Exchange, see Jeff Atwood's (slightly dated - IIRC job candidates are no longer charged) answer to "What is Stack Overflow's business model?": http://meta.stackoverflow.com/questions/79435/what-is-stack-overflows-business-model/79448#79448 http://meta.stackoverflow.com/questions/79435/what-is-stack-... And their Careers 2.0 employer page: http://careers.stackoverflow.com/employer http://careers.stackoverflow.com/employer