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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.
Jonathan Abrams' latest project raises seed round from investors including 500 Startups' Dave McClure.
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.