Marc Porcelli at Azoogle blogged about John Battelle blogging about Google Ad Planner Data Vs. Comscore. Of particular interest, Google’s bias toward it’s network and underreporting of visitors.

Marc, you need your own blog, I’m not going to link to a Plaxo blog, contact me if you want help setting up a new one.

Marc’s blog is Marcporcelli.com.

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