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Re:As Digg Struggles, VP Of Engineering Is Shown The Door by riffraff on Tuesday September 07, 2010 @03:47PM (#1669891)
as far as I remember: yes they were using it on v3 too, for some things
Re:As Digg Struggles, VP Of Engineering Is Shown The Door by wsongk on Tuesday September 07, 2010 @05:45PM (#1670198)
About a year ago, they were using it to store a list of friends of viewing user who dugg the viewing news.

original blog post: http://about.digg.com/blog/looking-future-cassandra

Treads on HN: http://news.ycombinator.com/item?id=813528