Today Twitter announced official testing of its new Buy button. The feature will allow for ecommerce sales on Twitter's platform which should provide a big boost due to the Buy button's official nature. Initial launch partners include Musictoday, Gumroad, Stripe and Fancy with a bunch more to follow including musicians like Pharrell, Ryan Adams, Eminem, Keith Urban, Megadeth and Wiz Khalifa. Twitter nicely sums up the most immediate news: "For a small percentage of U.S. users (that will grow over time), some Tweets from our test partners will feature a 'Buy' button, letting you buy directly from the Tweet." The...

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