"mixi apps" an OpenSocial based social networking service (SNS) in Japan is launched to all users, and has more than 220 apps already been registered. “mixi apps is a new service which lets social application providers develop applications that use social graphs formed within mixi, and provide these applications to mixi users. To achieve this, we chose OpenSocial as the best solution.” Two most popular apps are: "Kanji test" challenges users, who compete against each other, to write down how to read Kanji characters (also known as to "furiganize"). And "Recollect sketch" gives users a theme, and are ch allenged to draw it entirely from memory! In addition "mixi Ad Program" launched & shows ads within your application to make you profits through revenue sharing based on your application's page view.