What internet website is more addictive than crack cocaine?

Your favorite porn site would have been a good guess. However, I am referring to WikepediA. Two hours ago, I did a simple inquiry on chess opening moves. Now, I must pull myself away from the computer so I can get a measly 4 hours of sleep before going to work tomorrow...err, later this morning. Multitudes of links to almost anything you might ever care to know about...