deadsea - 11:39 am on Dec 5, 2012 (gmt 0)

Adsense ads cannot be crawled via a robots.txt directive: [pagead2.googlesyndication.com...]
Googlebot is not going to parse adsense ads for links because it cannot crawl them.

It appears to me that their javscript "parsing" is very rudimentary. They seem to scan the javascript for strings that start with "http", end in ".html", or contain a slash and treat them as if they were links. I know I get 404 errors from Googlebot from Google DFP ad setup. It contains strings like "123456/top_ad" in the javascript where 123456 is my dfp identifier and top_ad is my ad slot. If they are using the "links" they find this way for PR purposes, then I'm in trouble. (Maybe I should just go ahead and obfuscate those, come to think of it.)