Four cool tools for tracking trends: #4

Twopular (http://twopular.com) shows the trending topics for the last two hours, eight hours, day, week, month and "ever since." (The "ever since" category lists the most popular trends on Twitter since Twopular started keeping track in December 2008.)

It's handy not only because it gives you snapshots over time, but also because it has little icons telling you whether a topic was climbing, falling or staying in place at any given time.

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