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

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

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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