"Our strategy is very horizontal. We're trying to build a social layer for everything. Basically, we're trying to make it so that every app everywhere can be social, whether it's on the web or mobile or other devices. So inherently, our whole approach has to be a breadth-first approach rather than a depth-first one"

This quote by Mark Zuckerberg talks to the method of his business, Facebook. He is explaining a horizontal technique to developing a social layer for all applications. This indicates that Facebook is attempting to make all applications, no matter platform, social. This technique is different from a depth-first technique, which would concentrate on one application at a time. By taking a breadth-first technique, Facebook is able to develop a social layer for all applications at once. This permits them to create a more thorough social experience for users. By taking this method, Facebook is able to develop a more unified social experience for users across all platforms.