Chris13 - 7:03 pm on Mar 15, 2013 (gmt 0) [edited by: Chris13 at 7:16 pm (utc) on Mar 15, 2013]
If I didn't know better, the AdSense arrows would be the thing I'd click to advance to the next page. Pure MFA. My hunch is Google went after high CTR sites and niches abusing the navigation angle.
Interesting observation. One that had not occurred to me. When Nessie came out my CTR definitely rose. The layout of my site has always been the same and hasn't changed since I launched it on Oct 2nd.
My site layout has longer pages, about 3-4 screens worth for each item. At the top is a leaderboard, about half way down there is a leadboard. At the bottom was a rectangle (now removed).
The ads were placed in the open (no border), while the content areas are bordered. I've now added blue rounded borders around ads, so that it's clear what part is the ad. A bit late though.
If someone thought the arrow took them to more content, I can see that. Hadn't occurred to me, but that makes a lot of sense.
[edited by: Chris13 at 7:16 pm (utc) on Mar 15, 2013]