Yes, they do. I have tested this on several occasions. As a cyber security expert, it is my job to not trust what people "say," and actually "test"...
Continue Reading tech for security flaws. Drop your phone in water, the next ad you will see on Facebook is about water accidents with your phone. Say key phrases over and over again, without being logged into Facebook, then log in, and check the ads, your key words will be advertised to you. Just test this.