1. Sophia Bush Sophia Bush

    After the Deepwater Horizon Oil Spill, Sophia Bush uses Twitter to get the word out about her environmental activism particularly on ways her followers can help with the clean up and take actions to save the planet.

    Sophia Bush's Official Twitter Account »

    Sophia's Acceptance Speech »

  2. Ashley Greene Ashley Greene

    Using Twitter as an outreach, "Twilight" star Ashley Greene is the official spokesperson for Donate My Dress, a non-profit organization that provides prom dresses for girls in need.

    Ashley Greene's Twitter Account »

  3. Kim Kardashian Kim Kardashian

    Using Twitter Kim Kardashian auctioned off a chance to hang with her for a day with the proceeds benefitting Japan relief.

    Kim Kardashian's Official Twitter Account »

    Kim Kardashian's Official Website »

  4. Ashton Kutcher Ashton Kutcher

    Ashton Kutcher used his Twitter to successfully pressure Craigslist to shut down their potentially harmful "adults services" section.

    Ashton Kutcher's Official Twitter Account »

  5. Eva Longoria Eva Longoria

    Eva Longoria spearheaded TWITCHANGE, a charity drive that brings celebrities and fans together to bring awareness and financial support to charitable causes that change the world.

    Eva Longoria's Official Twitter Account »

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