Comment by insky

Regarding tracking. We had a hickup at work, with a url that triggered an expensive cronjob. It was being hit mysteriously. It turned out to be the new tab page in Chrome or Firefox (I can't remember which one), which was requesting the url routinely. This basically shows that whenever you open your browser a group of sites get requests, whether you have them open or not. Therefore if you have FriendFace say as a most visited site, they'll get a request from you everytime you sit in front of your machine pretty much.