Twitter wants to make its short-form social network the premier place for advertisers, brands and developers to market their products. To that end, the company today introduced a new tweet format that includes a prominent app download link. It’s currently being tested in private beta and gives Twitter advertisers a new way to encourage downloads across different mobile app marketplaces. Twitter says the new feature leverages both Promoted Tweets and Twitter Cards to show these promotions as a “rich, native ad unit.” Spotify, HotelTonight, Kabam, and Deezer have been testing the tool as early beta partners and Twitter, not surprisingly,...

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