> telling me where I can buy more of something I've just bought?
I bought a new car last year (I like compacts, and make them last for at least 5 years before considering changing), and receive spam from the dealer every two weeks with new, can't-miss offers of cars from the same dealership. Can't be more targeted than this. I talked to the dealers' manager about how irritating and pointless that is, and he sheepishly mumbled something about "the central office does the marketing". I decided to block it for the next four years, just in case.
Since I am in extended rant mode, what about ads like "this is the secret that doctors don't want you to know" and similar, that combines false advertisement, clickbaiting and spam in one convenient package?