The first time I blatantly noticed this was when I was trying to get a refund for a delayed flight. After doing some research on Google, the next time I logged into Facebook, I got ads for "flight refunds".
In my head I always thought: two companies, so there's no cross section of data sharing...but obviously they sell each other data because it benefits both parties!

The idea of giving the customer a choice in the matter is something I definitely agree with! More power to the consumer :)

Ty for the read!