X accesses various ad services which track your activity everywhere. They WILL know you. They WILL test you. You can report or block or mute... Which helps you AND them.
Discussion
I'd rather not help them build a profile of me, gross.
I double dog dare you to (if you still have it) log in to Facebook. I get served up lots of ads and videos for cars because that's been a hobby of mine since before I could drive. I BOUGHT the actual Auto trader pulps and still browse the site frequently. Now I get served ads like theirs and others. Oh, and hot girl bait videos because I'm a man who likes cars and BBQ. My wife gets only cute dog videos and cooking... They WILL know you by your cookies.
