As you stumble through the web, you give webpages a thumbs up or thumbs down, write reviews or comments and get to see pages recommended by people with similar interests to your own.
"I'm hooked on the thing, and rate it as the second most useful web browsing tool after Google itself" - PcPro Magazine
I downloaded the StumbleUpon extension from Mozilla to use with Firefox and now have my very own -
Mr-Smartypants's reviews
