Stumbleupon is a tool that recommends webpages based on your likes and dislikes. . With a browser toolbar you can easily click on “like” or “dislike” button. Rating and commenting of the delivered pages is optional, but it helps profiling your preferences. This is similar to Pandora for music. The toolbar quickly helps you to stumble and share in seconds.

Stumbleupon gained much popularity since the founding in 2001 and grew more than 150% a year since then. The number of users is said to be more than 3 million and the users create more than 5 million recommendations a day. No wonder Ebay grabbed it before Google and AOL could do it. Ebay announces that the recommendation system fits its portfolio already including Ebay auctions Pay Pal and Skype. I like this service because its real web2.0. It gives me an interesting and helpful output, it’s convenient and easy. I really hope that Ebay doesn’t use it to recommend buying some fake Robby Williams Tickets for 200 bucks to me.