Last week, Twitter's Claire Diaz-Ortiz, the company's leader for social innovation, released her book all about how people can use Twitter to be good global citizens. But the book, Twitter for Good, is only one part of Twitter's focus on social change: Hope140, Twitter's web site for supporting causes, serves as a launch pad for the various ways social media can make a positive difference. Here are the top 5 things Hope140 is doing right at this juncture.

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