OK, so I was searching for a treadmill on my work computer and then signed into Facebook. There were ads on my page for treadmills. I get that. Not sure how it works but I understand how one site could get info from another site. BUT: I was looking for a new iphone case on my iphone and yesterday at home and now today on my work computer there are ads for the exact same case I was looking for on facebook. Come on! How does that happen besides being one hell of a coincidence?