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Murdoch - 2:44 pm on Jul 17, 2008 (gmt 0)
I used Adwords primarily between 2004 and 2006 and I don't remember this. In fact I had my Google Rep send me a list of the sites on the search network (which I shared with some WW members) and it was only 60 or 70 sites long. Did this happen after March of '06? I probably still have the list around here somewhere. I'm sure it did not include parked domains, only relatively large companies like Tripadvisor that had a deal going with Google to use Adwords listings as their internal search results.
This is a newer development. Used to be that parked domains were part of the 'search network' and I'm pretty sure Google publicly defended that as making sense. They later changed this - but before, there was no opt out of parked domains.