In this particular case, there's probably no need to argue. If she mentions the targeting, I'd go for something like "yeah, creepy isn't it?" then briefly expl

In this particular case, there's probably no need to argue. If she mentions the targeting, I'd go for something like "yeah, creepy isn't it?" then briefly explain how FB, or whoever, are doing it. Follow this up by, "I can help reduce it if you want" or similar. I'd only push harder if it's affecting you directly in a way you consider negative. Then I'd make it about you not about abstract privacy concerns. Something like "I'm trying to control my privacy on the net and FB can track X when you post Y. Would you mind doing Z so that they can't?". Ideally, you can then pivot it into the "creepy" conversation above and help her control her privacy too.