John found duplicate content - slightly revised - on many webpages because these teeth whitening products are sold through affiliate marketing programs, which generally provide their affiliates with a lot of recommended content (to be slightly rewritten for search engine optimization) and images.  Last time I looked at teeth whitening it paid the affiliate marketer at least $35 per sign-up.  The affiliate marketers then advertise everywhere they can buy traffic cheaply enough to drive conversions for less than $35.  This can be quite lucrative when done correctly.<p>Jay Weintraub has written at length on both types of affiliate sites John encountered - the fake news site and the fake blog.<p>Jay on fake news sites: <a href="http://www.jayweintraub.com/2009/06/the-perfect-storm.html" rel="nofollow">http://www.jayweintraub.com/2009/06/the-perfect-storm.html</a><p>Jay on fake blogs:
<a href="http://www.jayweintraub.com/2009/03/the-rise-of-the-flog.html" rel="nofollow">http://www.jayweintraub.com/2009/03/the-rise-of-the-flog.htm...</a>