When most of us think about Facebook, open source software probably isn't the first thing that jumps to mind. As it turns out, the social media titan has quite a few public contributions that we rarely hear about. Since Facebook went native, Android development has become a high priority within the company. Among the many pleasant results of this shift, some of the internal tools may find their way into the public domain. One such project is Buck, an alternative build system similar to Ant, but designed to be faster and more modular.