It is completely based on your interest. See users will add sites they like, and they will be categorized. So I have a variety of interest, like world religions, video games, photoshop, humour, etc. I have gotten pages that were mock G.W. Bush's hotmail inbox to sits on Buddhism to sites that have Photoshop filters.

*clicks Stumble!* I got [url=http://www.trevorvanmeter.com/flyguy/flyGuy.swf]This[/color] Before that I got a page on Shakespeare.