Sony is expanding what the Vita can do in Japan with a Radiko.jp app. This application lets users listen to ground wave radio channels and you can tweet when listening to songs.
You can browse different programs using the station guide. Radiko is an IP locked service so you won’t be able to listen to TBS radio or anything like that outside of Japan. This and the NicoNico app are designed for Japanese users. Radiko.jp is available now on the PlayStation Store.