[theworst]

I also don't care if they show me pictures of wallets I like over wallets I don't like.

I do care when any third party knows where I've been, what I am interested in, and otherwise monitors my activity.

Like everything, it's a tradeoff. However, I acknowledge my primary concern is myself -- if not tracking me costs other people a slight chance at an opportunity, I'm must conclude to not include that in my calculus. (In fact, it would be to my advantage if I believed it were a zero sum situation.)