How Facebook works?

After the posting about Google (WSDM09) an interesting talk about how things are done @ Facebook . A lot of open source including Mysql, CFengine (for configuration), Thrift (for RPC), Hadoop (for MapReduce and data storage), Scribe (for data migration), Bittorrent (for code deployment, which is crazy but fascinating) , Hive for SQL like map-reduce, Ganglia for Clustering Monitoring, apache, memcached, etc.