Since launching in 2012, theSkimm has built up a big audience for its email newsletter — founders Danielle Weisberg and Carly Zakin told me they have more than 3.5 million active subscriptions, with a daily open rate of 40 percent.Today the New York City startup is launching its first iPhone app, accompanied by its first major service beyond the newsletter, Skimm Ahead. For a…
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