It is a sort of soical network site for radio listening. It only records your listening through the ‘radio pop’ live streams. I (like many) mainly listen to listen again and the radio iplayer, and they are working on intergrating with both. You can see my profile here.
You can ‘pop’ what you are currently listening to (basically a ‘i like this’ button). I’ve added my ‘pop’ rss feed to my dipity timeline.