I'm wondering about some ad networks nowadays, are they tracking via IP addresses rather than cookies? Example.... So I've been going to my parents house every morning for the past few weeks. They are "old" but I'm probably "old" on this website so they could be called "very old" Anyway, I'm drinking my coffee this morning reading a Mac Tech/Rumor website on my iPad (not this website). There was an ad for info on prostate cancer. We just found out my father has prostate cancer 1 week ago. I have never typed the words prostate or cancer on my iPad. He might researched prostate cancer on his computer? Why the hell do ad companies know this info? Somehow their IP address is associated with prostate cancer and showing me ads for additional info? Marketing companies know that my father has prostate cancer before he even has time to tell his children? How low can advertising go?