Twitter may seem like it’s all about text, but it is, in fact, developing into a vast and varied ecosystem for sharing everything from video clips to songs. With Twisten.FM, you’ll have a fun way to tune into the songs being shared and discussed at Twitter. That would a useful service on its own, but Twisten.FM goes far beyond providing a bare-bones tool for tuning in to Twitter tunes. Twisten.FM’s interface turns the service into a full-fledged tool for discovering music — and also potential twitterers to follow. One click, and you can play a song to check it out. Another click, and you can download the song from Amazon or iTunes. If you sign in to Twisten.FM with your Twitter identity, you’re able to view the songs your followers are listening to, and also to search for songs, listen to them, and tweet about them, with a handy link for your followers to the listen to the song.