Tired of reading tweets about breakfast and balloon boys? We've compiled a list of some of the top activists on Twitter, many of whom you might not even know about.
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Amanda Rose (@amanda)
Amanda Rose's Twestival has raised over half a million dollars for various causes over the last two years. The next Twestival, in March 2010, will raise money for educational causes, with a focus on some of the poorest regions in the world.