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A Second Class stamp thalidomide celgene 50 mg hard capsules Facebook is also adding a new way for app developers to pay for the ads they buy on its service. Until now, they\'ve paid on a cost-per-click (CPC) or optimised cost per impression (oCPM) basis, but now they can opt for cost per action (CPA) instead, only paying when people download and install their app from an ad.
