[BobPalmer]

I for one would have no problem with this. I'm well aware that the sites I go to will in many cases show custom experiences, just as I'm aware that Google tailors it's ads based on my browsing history.

If I am heading into an online retailer, or searching on the web, I'd much rather see relevant content.

I find this kind of customized experience a lot less intrusive/creepy than, say, having stuff randomly posted to my Facebook timeline, or ads showing up with my implied endorsement to my friends.