So is CPM or OCPM more beneficial?Some people assume that OCPM is worse, because it eliminates control out of your campaign and forces you to put trust in Facebook, hoping they know best where to spend your pennies. Others make an effort to test, to arise with interesting effects. In this situation, Jon has found that OCPM is miles above plain CPM in terms of conversion rates. The query turns into a contest among OCPM and CPC, or rather, CPA – Cost Per Action.
Facebook allows loads of activities, in place of just ad clicks, to be the trigger point for costing you money. These include conversions and page likes.