My wife’s Facebook page is showing ads for the exact pair of eyeglasses that I was shopping for.
That violated my privacy.
She wasn’t using the same computer. She never went to that merchant’s site (and if she did, she wouldn’t have clicked on that exact product).
Clearly the merchant paid a service to connect my non-Facebook shopping to my Facebook connections, and probably to my spouse specifically.
Marketers: Just because you can do something does’t make it right.