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Twitter shares plunged Tuesday after an earnings report that fell short of market expectations despite a jump in the number of active monthly users above 300 million. Twitter reported that revenue during the first three months of this year was $436 million, while the San Francisco company had been expected to bring in about $456 million. Twitter separately announced a deal to buy marketing technology company TellApart and a partnership with Google's DoubleClick platform to improve advertising performance. Twitter shares dropped more than 17 percent to $42.63 in trading that followed release of the earnings figures.