Twitter shares tumble on forecasts for weaker revenue, higher costs

Twitter Inc forecast that revenue in the first quarter would be weaker than expected while full-year operating costs would rise, sending shares down more than 10 percent in midday trading on Thursday. Investors' concerns over the weak forecast overshadowed strong fourth-quarter results for the social media company that included a 24 percent jump in total revenue, helped by growth in its video advertising business. Monthly active users on the social media platform fell to its lowest in two years and for a third consecutive quarter.

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