Amazon MP3's Twitter account just surpassed 1 million followers, and to celebrate they're offering 1 free MP3 download of your choosing (provided you can buy it for the $1.29 in credit they're handing out, which I think should buy pretty much any song in the Amazon MP3 store). Just head to the promotion page, enter the FIRSTMIL code, and go buy yourself a song. The offer is only valid for a limited time (Sept. 3 to Sept. 6). Your Choice: Get One of Millions of Songs

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