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Given the drubbing Twitter's stock has taken lately thanks to its admission that its growth has been slowing, today's announcement of #AmazonCart -- "Add it Now. Buy it Later. Shop from within Twitter" -- is very welcome news. It adds another layer of functionality to Twitter, but does so by using an existing signature element, the hashtag, that Twitter users are already comfortable with. Watch this quick video for the simple explanation of how it works.
Simon Dumenco is the "Media Guy" columnist for Advertising Age. You can follow him on Twitter @simondumenco.