Other than microsoft themselves: myspace is still fairly huge but probably a mixed stack. Plentyoffish is up there too - http://highscalability.com/plentyoffis

Other than microsoft themselves: myspace is still fairly huge but probably a mixed stack. Plentyoffish is up there too - http://highscalability.com/plentyoffish-architecture http://highscalability.com/plentyoffish-architecture