A man who has been thinking about purchasing a new HD Sony TV has been comparing prices online. The next day he receives an email from Amazon.com with an exclusive offer on all HD Sony TV’s. Surprisingly enough, another ad from Amazon featuring TV’s appears on the side of the website he just visited. He also notices that HD Sony TV’s are being recommended for him on Amazon under, “items that you might be interested in.” Confident that he has found the best price and satisfied with the…