Digg described the model for their "green badges" feature in http://about.digg.com/blog/looking-future-cassandra http://about.digg.com/blog/looking-future-cassa

Digg described the model for their "green badges" feature in http://about.digg.com/blog/looking-future-cassandra http://about.digg.com/blog/looking-future-cassandra, fwiw.