There are some interesting trends that appear to be emerging in the PubMatic AdPrice Index, which is a broad-based measure of ad network pricing information. The above chart comes from their website, and shows monetization rates broken out by large (100 million + per month page views), medium (1 – 100 million), and small ( < 1 million). On a relative basis, it’s clear that the rates for small sites are much higher than large ones – which might not be a surprise for many. However, the major drop for large sites in April (from 0.38 to 0.18), coupled with the impressive increase for small sites (1.18 to 1.29), could turn into a major story if the “sudden” change turns into a trend. I first saw this report on the longtail blog - you can read more on this topic on their May 8th post as well - You may be on Facebook, but the money is in the longtail.