Ok, I got something to say. I've noticed this for quite some time. Not only that, I tried some tests too.
I know that they can track internet traffic and relate some ads to what you've been looking for, so whatever I used to test this I never related it to any online activity or spoke in person with anyone.

The thing is that I discovered that ads actually change with your thoughts. As crazy as that may sound, I was in almost complete silence when I tested this. Fortunately, I've gained full control of what goes into my mind and what doesn't. What comes from ME and what has been sugested either explicitly, or using some other technology.

I can make the ads change into various products and services only by thinking about those things. When I close my mind, take no thought, the ads get stuck or start showing random things which simply don't apply to my interests.

I urge you to practice the blank mind state. Let go, let go, always let go. Are you angry? Let go... are you sad? let go... only by letting go, eventually you'll regain control over your mind.