Quote from Google Chrome browser, which allows you to "go incognito" to avoid pages being shown in your history (*cough* porn *cough*):
Going incognito doesn't affect the behavior of other people, servers, or software. Be wary of:
- Websites that collect or share information about you
- Internet service providers or employers that track the pages you visit
- Malicious software that tracks your keystrokes in exchange for free smileys
- Surveillance by secret agents
- People standing behind you
Yeah. Creepy. When I read that last line I actually got a prickle on the back of my neck. ^_^