A quick way to find out what’s trending on Twitter and why can be found at WhatTheTrend. Get last week’s Twitter trends, the Year in Review and also topics trending around the world. Definitions of hashtags and explanations of why something is trending are provided by users. A tool for comparing global and local Twitter trends against previous time periods is available in the paid version. Currently AdAge and Mashable use WhatTheTrend to compile their weekly trending columns.
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