| http://www.w3.org/ns/prov#value | - If auto ads, generally among the most effective online promotions, fail on Facebook, then major advertisers including AT&T Inc., Procter & Gamble Co. and American Express Co. may follow GM???s lead and curb spending on the site, said Carlos Kirjner, an analyst at Sanford C. Bernstein & Co. in New York.
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