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Im going to assume this is sarcasm since Facebook is built entirely on sharded MySQL. Don't want anyone else to get confused in case it doesn't come through for them.

Facebook, et al, use memcache and a plethora of other products to improve the scalability of MySQL. Here's one scalability comparison between the two: http://tweakers.net/reviews/649/7

That is a comparison from 2006 using MySQL 5.0.20 (ancient!) and as such is completely irrelevant to any discussion on performance in 2012. Dramatic scalability improvements went into late 5.1.x releases, and then even more in 5.5.

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