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Possible Duplicate:
How to start and encourage an online community?

How do you start an on-line community QA site similar to stackoverflow?

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    You start by writing software that might foster it? After that, seek patient investors.
    – Tim Post
    Jan 25 '11 at 15:24
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How do you start an on-line community QA site similar to stackoverflow?

This question was answered recently by Joel Spolsky:

We learned a long time ago that the only way to get questions answered promptly is to have a critical mass of knowledgeable users, so we have an onerous process called Area 51 where sites are proposed, discussed, and voted on. If a proposed site doesn’t have critical mass, we just won’t create it.

Stack Overflow 2010 Recap

If you're interested in starting up a similar venture, you'll find plenty of good advice and ideas at StackOverflow Meta and at Joel's blog.

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If you have web development skills you could try building your own. But for a pre-built script check out some of the clones mentioned here. https://meta.stackexchange.com/questions/2267/stack-overflow-clones