Here is what the site says about itself:

“We help you explore your passions by collecting stories from “all the top” sites on the web. We’ve grouped these collections — ”aggregations” — into individual Alltop sites based on topics such as environment, photography, science, celebrity gossip, fashion, gaming, sports, politics, automobiles, and Macintosh. At each Alltop site, we display the latest five stories from thirty or more sites on a single page — we call this “single-page aggregation.”

You can think of an Alltop site as a “dashboard,” “table of contents,” or even a “digital magazine rack” of the Internet. To be clear, Alltop sites are starting points — they are not destinations per se. The bottom line is that we are trying to enhance your online reading by both displaying stories from the sites that you’re already visiting and helping you discover sites that you didn’t know existed. In this way, our goal is the “cessation of Internet stagnation.”