"Phonetags is about bookmarking songs you hear on the radio using your mobile phone. The way you use it is very simple. If you're listening to a radio network (initially BBC 6 Music) and you hear a song you'd like to make a note of, you pull out your mobile phone, type an 'X' into an SMS (remember: X marks the song) and send the text to a BBC short-code. Later when you come to the site, you type in your mobile number into the search box to see a list of all the songs that you've bookmarked."
-- Plastic Bag
