The best converting page on is the inbox.

Did you know that the IAB banners do NOT appear on the inbox? Only the 110×80 text ads and 310×110 SMALL BANNERS do.
Now, thanks to Mr.Green’s case study, we know that the 310×110’s have the ability to outperform the 110×80’s, would you say that
creating/duplicating 310×110 small banner campaigns would be a good thing to test?

TL;DR: 310×110 = good performance & appears on the inbox, inbox is POF’s best converting page.