I'd be happy to pioneer it on LW if it was a simple enough algorithm. StackOverflow, MathOverflow, Quora, possibly Reddit might be quite interested if it worked. (I don't know if there's acknowledged borrowing - keeping in mind that we borrowed all of Reddit's code in the first place and it was under an open-source give-back license - but Reddit seems to have adopted LW's highlight-recent-comments innovation, so there's been some backflow.) Wikipedia is disintegrating under the weight of deletionists and would probably have to be rebooted more than healed, but Earth needs a Wikipedia. There are plenty of likely adopters / testers / provers in advance of the general scientific community if a superior karma algorithm can be found.