[bbarthel]

Privacy - Normally my interests are more technology-oriented, so I would expect my ads to target computers and technology. However, every year around the holidays and my wife's birthday my browsing takes a more practical turn. If she were to hop on my laptop and notice that all my ads are now for jewelry, it doesn't take a genius to put 2+2 together, and the surprise is ruined. And this is just a benign example of how targeted ads might "leak" undesired information to third parties (imagine some of the more embarrassing things that might be targeted).

Quality - My experience with targeted ads usually involves them lagging behind my purchase or interest. So if I set out to buy a new saw, by the time I start getting ads related to new saws, I have already purchased it. Everybody loses (Advertisers waste money targeting a purchase I already made, and I keep seeing ads for a product I don't need anymore).

Both of these scenarios occurred recently, and I don't really know a good solution to the problem.