StumbleUpon is by far one of the most addictive social bookmarking websites I have ever fell pray to. Even one accidental click of the stumble button and it's all over but the clicking.

We have to be able to learn something about our businesses through StumbleUpon, but what? Here are some ways you can use StumbleUpon to help better understand what your market really wants.

What are the most popular, interesting and informative websites