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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Craig Newmark (@craignewmark)
Don't know who Craig Newmark is? You're on a first-name basis with him already, as he's the founder of Craigslist. These days, he's looking to do more than just sell you his couch. On issues like health reform, Afghanistan, and how best to encourage public service, Newmark has made himself a top tweeting changemaker.