Clicking links within mobile apps can be a messy situation, as you might go from a streamlined social app to a sloppy webpage not optimized for small devices. Facebooks AppLinks tool aims to change that, as developers can seamlessly send users from one app to another via a simple html code. Announced Apr. 30 at Facebooks F8 Developer Conference, AppLinks is a free, open-source code that allows for easy app-to-app linking.