sorry... but I wanted to make another point:
When ranking pages, Google takes into consideration the quality of the traffic... so 1000 hits to your website from people who have an incentive to visit your site is far less valuable in Google's eyes than 100 hits coming from blogs, ezinearticles, other people quoting/referencing your site, etc.
So that's something to think about when evaluating whether the traffic exchange program is useful for your purposes.
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