Recently, we changed the inbox page to display 110×80 and 728×90 ads (instead of the 300×250 ads). So for most advertisers, you’re going to see more inventory for your 110×80 or 728×90 campaigns as a result! Keep in mind that the inbox is the best converting page so newer POF advertisers have a chance to have their ads placed on that page (if your CPM is high enough)!

Cheers!

Ben