Michael's post was a bit disjointed, because it talked about two fairly unrelated topics:
- Google's hypocrisy in penalizing people for compensating bloggers for product reviews
- Potential unfairness in Google's profiling of SEOs
Google's hypocrisy is beyond question and beyond belief, but you asked about profiling.
I do believe that Google profiles SEO's, based upon data such as:
- AdSense ID's
- WHOIS records
- Hosting companies (a.k.a. IP addresses)
- Google Webmaster Tools tags
- Google Analytics tags
Personally, I have been very up front with Google by keeping all of these variables constant across my web sites -- but Google has not rewarded me for my honesty.
When I have a few weeks to work on it, I would like to start making more of my projects difficult for Google to profile.