Mathoverflow.net is an internet site on which people can ask and answer math questions. It elicits a good deal of effort for free, in an Open Science, reputation-mediated way.
It has a reputation system, based on the votes "up" your questions and answers get. Other users can also reduce your reputation by 2 points, at a cost of 1 point to themselves, if they don't like your posts.
There's also a set of distinctions that users can earn, called badges.
HT: Aaron Roth
Thursday, January 21, 2010
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This is based on StackOverflow and the Stack Exchange platform.
http://stackoverflow.com/
http://stackexchange.com/
http://www.metafilter.com/85924/Math-Overflow
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