Tom Kaulitz
Tom and Bill released an app named “BTK Twins” for Android on December 19, 2011 and on IOS on January 16, 2012, to keep in touch with their fans. On the app Tom and Bill  were posting photos, videos and text messages and fans can leave messages which the twins often respond to. In November 2013, app was removed from both the Android and IOS store, due to the imminent release of Tokio Hotel’s new album.