incrediBILL - 11:43 pm on May 18, 2012 (gmt 0)
The vultures are circling, they smell money.
Just because you log out doesn't mean your cookie was destroyed, silly people. This is true of all websites, not just Facebook. Additionally, many cable companies issue IPs that last for years, so as long as you keep using that IP you're trackable as well.
Visit a few of my sites and I'll show you what tracking is all about ;)