Two weeks ago, an e-mail landed in the inbox of Ben Stiller, the Hollywood actor. With the release of Tropic Thunder, an upcoming action comedy, would he allow his image to be used in a computer game to be distributed on Facebook?The social networking site is well-known as a way for its 80 million members to keep in touch, but it is only beginning to assume a new guise as a gigantic viral marketing platform. And companies are lining up.
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