| Wall Street Journal Twitter has bolstered its advertising business in recent months by refining its targeting abilities and introducing an array of new ad formats. Getty Images. Twitter Inc. TWTR +4.64% Twitter Inc. U.S.: NYSE $42.62 +1.89 +4.64% April 29, 2014 4:02 pm Volume … Twitter tanks as user growth falls shortMarketWatch Twitter Drops Sharply As User Growth Continues to SlowTheStreet.com Twitter beats estimates but shares slammed on user growth worriesCNET Reuters –USA TODAY –The Globe and Mail all 183 news articles |
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