Search marketers may not find comfort in Facebook's ability to monitize the advertising on its social network. Matt Kapko points to a study from TBG Digital that found Facebook's cost-per-click prices have begun to rise, surpassing $1 for the first time in the United States, where CPMs jumped 25% in the last quarter. "The Facebook mobile ads also performed much better than Twitter ads, said TBG, which recently measured 24 million Twitter ad impressions," he wrote.