Evan Williams is the co-founder of Twitter, the addictive messaging service that connects the world 140 characters at a
time. Twitter exploded in size (up 10x during 2008 alone). Co-founder Evan Williams reveals that many of the ideas driving that
growth came from unexpected uses invented by the users themselves.

Jacqueline Novogratz founded and leads Acumen Fund, a nonprofit that takes a businesslike approach to improving the lives of the poor. In her new book, The Blue Sweater. Jacqueline Novogratz tells a moving story of an encounter in a Nairobi slum with Jane, a former prostitute, whose dreams of escaping poverty, of becoming a doctor and of getting married were fulfilled in ...
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Majora Carter fights for environmental justice in her hometown of New York's South Bronx. She's working not just to hold back the polluters who target low-income neighborhoods like hers.
In an emotionally charged talk, MacArthur-winning activist Majora Carter details her fight ...
Juan Enriquez thinks and writes about the profound changes that genomics and other life sciences will cause in business, technology, politics and society. Juan Enriquez challenges our definition ...
<< MORE >>Jeff Skoll was the first president of eBay; he used his dot-com fortune to found the film house Participant Productions, making
movies to inspire social change, including Syriana; Good Night and Good Luck.
Film producer Jeff Skoll (An Inconvenient Truth) talks about his film company, Participant Productions, and the people who've inspired him to do good.