Facebook is touting the power of social advertising to big brands such as Ford and PepsiCo, in a bid to spark interest in social-context ads, which tell users when their contacts have expressed interest in the brands on display. "Marketers have always known that the best way to sell something is to get your friends to sell it ... That is what people do all day on Facebook. We enable effective word-of-mouth advertising at scale for the first time," says Sheryl Sandberg, Facebook's chief operating officer.

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