What are these different cost models (CPM, CPC, CPA)?
Cost per Mille (CPM) for an advertiser is the cost for every 1000 impressions received. For a publisher, it is the amount earned for every 1000 impressions delivered. Cost per Click (CPC) for an advertiser is the cost for every click received. For a publisher, it is the amount earned for every click received. Cost per Acquisition (CPA) is available to advertisers to represent how much they are charged for every acquisition. In the context of social networking applications, this translates to a user installing an application. We currently offer CPA campaigns only for application developers.
