So is CPM or OCPM more helpful?Some people assume that OCPM is worse, as it removes control from your campaign and forces you to put trust in Facebook, hoping they know best where to spend your pennies. Others take some time to check, to arise with interesting consequences. In this case, Jon has found that OCPM is miles above plain CPM when it comes to conversion rates. The query becomes a competition among OCPM and CPC, or rather, CPA – Cost Per Action.
Facebook allows a variety of actions, in preference to just ad clicks, to be the trigger point for costing you cash. These include conversions and page likes.