What if when you bought a new Macbook, the price was higher because your tweets constantly referenced your love and devotion for Apple?
http://thenextweb.com/insider/2012/01/21/behavioral-pricing-a-consumer%E2%80%99s-worst-nightmare-a-merchant%E2%80%99s-dream/
Would have thought that "wisdom of crowds" defining internet use would prevent individual pricing by person by interests, especially when price is already a major consumer buying consideration?