So I'm working on trying to get a better handle on the new Adwords Quality changes and came across something very interesting this morning. I bought a new domain yesterday afternoon and last night created a landing page on it. I looked in the log file this morning and there were only 24 lines. Of those 18 were from my IP. The other 6 lines were from Google IP's, Now I'm aware that at some point all of the ads pass in front of human so one is a person the other is the adwords bot. According to Google the adwords bot uses [AdsBot-Google] as a user agent (see Adwords Support). Let me stress again this is a brand new domain with no external pre-existing links. The real clincher is the time of the first visit with the GoogleBot UA match almost exactly to when I submitted a new ad to adwords. You can see the sanitized logfile here.