If you really think about it that's what advertising is, isn't it? Introducing the right stimulus at the right time at the right place to hopefully make you act when you otherwise wouldn't. But it's not just about advertising....having someone or some entity - with much better analytical capabilities than you yourself - posses all this fine grained knowledge about you and you knowing nothing about them and having no control over their actions (in terms of what they can do with your information) it's just asking for trouble. I think we're at a wall here so let's agree to disagree - at least this way we're both happy...