Drupal isn't only for work: it's also for play, as "FarmVille" creator Zynga proves. While their games usually appear as apps on social networks such as Facebook, its main site is on Drupal. It's a terrific example of how Drupal is used in the entertainment industry. After all, Zynga's annual revenue in 2010 was almost a billion US dollars, and is aiming for an initial public offering that values the company at $15-20 billion.
— Dries Buytaert