All I can say is "No shit, Sherlock". I'm constantly bombarded by ads for stuff I've already decided to buy (or more usually that I already bought last week).

All I can say is "No shit, Sherlock". I'm constantly bombarded by ads for stuff I've already decided to buy (or more usually that I already bought last week). This stuff has zero value. The point of advertising has always (until now) been about taking your product to people who didn't know it was there. Targeted advertising would be a funny joke if so many people didn't take it seriously.