Why I'm payng for CPM?

Hi,

I chose to pay by the CPC, so why am I even paying CPM?

Thanks

 

Let me explain, excuse my poor English. I'm used to the PPC (Adcenter,Adwords), I just started a Facebook account and I do not understand why, having selected the CPC, in my first campaign appear the costs of the CPC and those reported to the CPM, which means that I'm paying impressions. I do not understand why. If I am not mistaken I should pay only the costs of the CPC ... or what?

 

Please, anybody know why FB lists both CPC and CPM costs?