webcentric - 4:16 am on Sep 22, 2013 (gmt 0)
The biggest change to text ads made in years has been the addition of the button.
My point is that they are not just messing with the button now so how can you have a discussion about just the button. The whole format of text ads has been changed radically so it's hard to say that any changes in CTR are related to the button or the layout of multiple ads into panels or the bigger title text (now NOT underlined) or the interactive features or the imagery that is becoming part of the "text-ad" landscape. There are so many new variables in the equation at this point that it's almost impossible to evaluate them in any sensible fashion. They're all pretty much a package (to enhance or not enhance? that is the question). Also, if you're seeing ads that look nessie-ish except with a round button instead of a rectangle, you might want to look at them in different browsers. Ads don't render the same in all browsers yet (at least the last time I looked). This is crazy. I was in the middle of evaluating enhanced text ads (when they started showing favicons) and the next thing you know panels started appearing. It may take awhile for all this to settle down before any real data is available. Some people literally aren't even seeing this stuff yet or just started seeing it a day or so ago. It's pretty hard to say anything definitive with just a few days worth of data. As many will attest, Adsense isn't as predictable as it once was.
--Added. I didn't see round buttons (and many other didn't either) until the other changes mentioned above were released. So not everyone has not the same history with round buttons that you may have had.