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In silicon valley who explored facebooks ad business for mits technology review says the ad part of the social networking company is only growing. >> by all estimates it did a couple billions of dollars in advertising last year and may double that this year. so it seems that the advertising machine has started to take off there. >> reporter: robert hoff adds that facebooks last foret into ads backfired before the company changed its practices. mary snow, cnn, new york. torrential rain and mass...