First use of stumble upon

Recently I have installed a service called stumble upon. It is like a user voting system on website. You would install a toolbar and select the topic that interested you. Whenever you click the stumble button, it would take you through a random website. You can choose like it or don't. The more you choose, the more accurate it gets.

It is interesting initially. But after a while, still get a little bit boring. Because the website is truly random and you are depending on other people's suggestion to discover new site. Might need to try it out more to decide whether to keep it.