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The help screen explains a little more: http://www.google.com/support/moderator/

But it's still unclear to me how this differs from, say, a typical phpBB installation.

> But it's still unclear to me how this differs from, say, a typical phpBB installation.

Fewer security holes?

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So is this Google's first evolutionary step towards something equivalent to Stack Overflow

I think it's more like Yahoo!Answers

+1