Basically, any page on Internet have three dimensions. There are vertical scroll, horizontal scroll, and links. Someone told me that an interface is considered not good if users have to click many things to get what they want. That is the first point.
Second, it is my personal taste. I like to read all in one page. I don’t like infinite scrolling, though. Mostly it will absorbs your bandwidth.
Third, it could be used to troll you, like this post.