Karma/Reputation Plugin for Ruby on Rails? [closed]

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I am looking for a karma (reputation) plugin or gem for Ruby on Rails. Preferably one that was integrated many of the best practices and research around the topic of community management & development. Any recommendations?

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There's vote fu.

Howver my advice would be the following : don't rely every time on plugins.
For some things that could be completely different from one app to an other, relying on a plugin can sometimes makes things harder to implement.

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Update for 2012

merit seems to be the new kid on the block!

For a (hopefully) all-time list, goto Ruby Toolbox - Reputation Engines .