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Is there much that is good about predicting this stuff?

I find Amazon loves to tell me to buy ... the thing they know I just bought and you don't need more than one of ...

I hardly ever get ads or offers for things I want.

How do you mess that up?

Google seems like they target by age, gender and income rather than by interests. Sometimes it's convinced I'm a yuppie and keeps showing me luxury cars, personal care/beauty products and high end electronics (when I have zero interest in any of those products).

Ironically I find the "dumb" ads on cable tv news to be a lot more effective since they have to target by interests.

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