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And just to be clear on this we don't run adwords traffic into this site so I don't see the connection but the feedback is appreciated.
I don't think this is unusual, you probably have nothing to be concerned with.
I answered with a pretty fast and short "yes" in my first reply. It was not just the IP address itself that made me feel this was a manual review, but also the site: operator query that kidder noticed in the referer.
I have noticed a Google IP doing site: operator query for specific keywords related to the landing pages that I have created an Adwords ad for. Usually within a week after the ad has been running. It has been fairly consistant for each time a new landing page is added, so I just concluded these were part of the Adwords quality control
Maybe an employee was actually using your site for whatever topic you cover and was looking for a more specific topic.
The specific searches i.e. site:example.com keyword(s) A are ususally the title of the page or in the title of the page and would not be a search for more specific page than the landing page given.
I've had a few funny calls from Mountain View & Redmond (on the fly reverse phone number checks) -- that I was sure were manual reviews.
I think we actually went down in the MSN Serps after one call from a lady at Microsoft. Oops, should have been nicer.
13:04:43 www.google.com/search?hl=en&q=site%3Awww.example.com exactproductname
13:28:36 www.google.com/search?hl=en&q=site%3Awww.example.com freeservicename
To clarify, this site DOES NOT host adwords / adsense - the whitest hat site ive got. This has puzzled me. Any other site I would be sure it was a manual review, but not this one - I can't even see anyone reporting is as its not even commercial.
this site DOES NOT host adwords / adsense
To offer the opposite end of the spectrum, many of these Google 'visitors' only visit specific landing pages for PPC.
I still think it's a bot ;)