Now this is certainly a new way of using Twitter for promoting a product, or in this case a song. Jack Johnson, the American singer-songwriter is inviting Twitter users to Tweet about his latest album and in return you will be able to download a Free MP3 from the album. In fact, the download starts as soon as you login in to Twitter and send the Twitter update. So, Jack Johnson's new album starts getting promoted around the Twittersphere, he gets into trending topics and you get a Free MP3. Win, win, win!
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