My name/number is already pretty much public information, you can find it in various public registries if you search. But who I have in my contact list is _not

My name/number is already pretty much public information, you can find it in various public registries if you search. But who I have in my contact list is _not_ public information. You can infer a lot from that. And the idiots who create these social apps always assume you want to "connect" with whoever is in your contact list. Even if you added their number so you know to _not_ pick up when they call.