.. a great way to waste time
I have fallen for it. I did not want to install it. I heard about it. I was warned. Yes, I am guilty as charged.
Today I installed the addictive Firefox extension StumbleUpon. Cicking a button takes you to more or less random sites all over the Net. It is so addictive, that you will forget time, lunch, dinner, work, your wife, your kids, your reason to breathe.
DO NOT INSTALL!!!! It is like selling your soul to the Devil.
Do not say I didn't warn you.