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Twitter purchases Summify and its social-media news aggregator, but it's not clear as to how Twitter will be making use of the new product just yet.
E-mail contains list of "most relevant" tweets and stories shared by the people users follow, along with links and various tweeting features.
Twitter's hired most of the team behind social e-mail marketing company RestEngine.
Jonathan Abrams' latest project raises seed round from investors including 500 Startups' Dave McClure.