This Ad Stinks: Let Readers Vote

Online marketers are finding that rating of their campaigns by social networks can yield big rewardsor humiliation

For Billy Bloom, advertising with StumbleUpon was a bit like stepping into the Coliseum in ancient Rome: If StumbleUpon users liked—Bloom's site for trading CDs, DVDs, video games, and books—they could endorse it by clicking a "thumbs up" icon. A few thousand of those might make a hit as word spread among StumbleUpon users and, perhaps, their friends.

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