Word clouds are certainly inexact, but the differences in the words, results and colors across these slides are both meaningful and striking.

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These are word clouds, put together by Yahoo Labs using Wordle.

FORBES: , Facebook and "Like" Clouds: A Social Media Report Card, of Sorts - Forbes

Yoni Ben-Meshulam's R We the People is a package for the R statistics environment that allows users to generate word clouds and visualize the issues that petitions are created about over time.

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Fair warning: Making word clouds may be addictive.

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Its simple interface has to date allowed people to create and share over 72, 000 visualizations ranging from the an analysis of the budget for the city of Moscow to tag clouds of the most common word in lyrics by the Beatles.

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