StumbleUpon.com is a site that recently became available for Internet Explorer.
The main idea of the site is that people can market their sites directly to their target audience so users will actually pay attention to, instead of the basic banners and pop-ups usually used. At the site you will be able to download a tool bar to their web browser that allows them to discover new sites that are of high quality based on their interests and what they have seen before. If the you like the site, you can give it a thumbs-up, and if you did not, you can give it a thumbs-down just by clicking on the tool bar. Users can also look at other people´s reviews of the page and review it themselves. Once you´ve searched the site a few times and have rated a bunch of pages, a network is created and a list of people they believe would be good possible friends for you based on your similar site reviews are recommended. So check this site out. 
