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Perhaps this is proof that social networking ads aren't big earners: Google has pulled all AdSense ads from Orkut. They're now calling the deployment of ads on the search engine's popular social network a "test" run, and the decision to pull all ads suggests that the test didn't deliver high returns.
But lack of revenue isn't the direct cause of the ads being pulled: instead, the WSJ says it's a reaction to complaints from SaferNet, a Brazilian nonprofit group. Orkut is huge in Brazil and India, but not a big player in the US market; the Brazilian group alleged that by displaying ads next to child pornography and other illegal content posted to the site, Google was profiting from these crimes.