The Internet is its own little world. Actually, it’s a massive world that presents a seemingly endless array of options. According to a study done by MIT, the average American spends 24 hours a week online. That’s an average. Some people are locked into the Internet every waking minute of their day. Despite its sheer size (currently over 644 million websites), people typically spend their time online on a very small number of sites. Today, we take a look at four of the most visited websites in the west and what makes them so popular.