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I found two sites which looks similar to Stack Overflow.

Both sites are Q&A sites for different purposes. But I didn't notice the accounts tab in users details (association account).

I mean, are they using the API of Stack Overflow to build their own site or something else? What should we take care before signing up to those sites? (I mean a trustful site (as Stack Overflow) or not.)

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up vote 4 down vote accepted

These sites are Stack Exchange 1.0 sites and are separate from Stack Exchange et al.

You were able to pay for your own version before the Area51 process started.

There is a list of SE1.0 sites available here and both of these sites are listed.

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2  
Update - it seems the list of SE 1.0 sites is no longer available, presumably due to them being closed down... – John C May 12 '11 at 20:59

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