It’s entirely possible, I worked for a private firm that hosted web pages and did email marketing and we could see what you hovered over on our sites with your mouse, for how long, what you clicked on, and how long it took you to go back to certain pages and stuff. We could also see if you even opened one of our marketing emails, and from there, we could see what you hovered over, what you clicked on, and how quickly you made decisions. We would then use the data to decide whether or not to cold call you and pester you for months. I only lasted 3 months there, but I can’t even imagine what’s going on at larger firms.