It was around when I was pregnant when I started noticing more "family" and "baby" oriented news, ads and suggestions on Facebook, although I'd done all of my Googling about pregnancy and babies in incognito mode (not logged into any personal account either).

Well, that and all the times I get a push-notification along the lines of "We can't help to notice you're at /---/". Like suuure, I definitely want to share all the times I go to a doctor's office or a public bathroom with all of my "friends". (I get those from both Facebook and Google).