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Re:Ask HN: What language(s) is Facebook written in? by zalew on Tuesday June 29, 2010 @11:21PM (#1473780)
Re:Ask HN: What language(s) is Facebook written in? by badave on Wednesday June 30, 2010 @02:21AM (#1474056)
Don't forget about Cassandra, which they developed just for scalability issues that they were having, and is now used at Digg and other sites (I think reddit uses it for something as well now) http://www.facebook.com/note.php?note_id=24413138919