riyusaki.com is a user behavior prediction service. Based on what user browses, we predict his favorite color, song, movie, etc. To check the results, user has to visit riyusaki.com with active plugin. Having a plugin is the necessary condition for riyusaki. However riyusaki.com does not save any personal details of any user. Users have a choice, if they want to see predictions on themselves, they may install and keep the plugin active, else not.