General Motors Co and Facebook Inc are discussing the return of the U.S. automaker as a paid advertiser almost two months after GM said it would stop running ads on the social networking website, sources close to the situation said on Tuesday.

The decision by the carmaker, which spent $10 million on Facebook in 2011, was the first highly visible crack in Facebook’s strategy and underscored doubts about whether advertising on Facebook works better than traditional media.

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