All information you've explicitly disclosed to them yourself. If you'd complained about how much stuff companies like this infer about you then you'd have more

All information you've explicitly disclosed to them yourself. If you'd complained about how much stuff companies like this infer about you then you'd have more of a case about privacy. e.g I've never given Facebook my phone number but I'm almost certain that FB already knows what it is since my friends have it in their address books. Address books which they've (perhaps unwittingly) handed over to countless companies. Even then, me leaving such services doesn't stop them from knowing things about me.