Zynga’s newest game, CastleVille, is the fastest growing app on Facebook six days after launch and is the company’s fastest growing game ever.CastleVille now has around 5 million daily active players after being live for six days. CityVille, Zynga’s most popular game, had 3.2 million daily active players six days after its launch. FarmVille had 2.7 million daily active players six days after launch.

via Zynga’s Newest Game Is Its Fastest Growing Ever.