Enterbrain indicates that social games have seen radical growth in the past couple of years in Japan. Social gaming was worth an estimated $326 million in 2009, whereas it ballooned to $1.43 billion in 2010.

The study also says that 37 percent of all social game users have spent money on a social game, and roughly 20 percent say they’re still spending money. 30 percent of social game players own a smartphone and for those that still own feature phones, 54.4 percent of them are interested in getting a smartphone and a further 80 percent of those users say that when they purchase a smartphone they intend to continue playing social games.

Source: Enterbrain.com