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It seems that randomly floating in the banner areas on gamefaqs there is a banner that has a borderlands 2 graphic saying that xfinity is giving away free download of BL2 content. If you click on it it will have you connect your FB with an xfinity app and then give you a code to download the addon. It said there were only 1900 left and that was about 30 minutes ago.
The banner seems to appear randomly so either keep refreshing a gamefaqs page or click on several links until you see it