StumbleUpon: Friend or Foe?

Don’t get me wrong. StumbleUpon is obviously a great invention. Its provided me with hours of entertainment and lots of funny links and pictures that I send my sister en masse with my own captions. Like this one:

L00k! It's you and me! I'm the one looking annoyed and nervous at what you're doing and you're the one flying!

But I seriously haven’t done anything since I downloaded this amazing, convenient, funnest tool bar ever invention. It would only be better if it clicked itself when you're ready to move on to the next page.