title: Facebook File Names
body: <p>I've been checking out Facebook code lately and all of their images and files have names comprised of just random letters and numbers like "FSEB6oLTK3I.png", "cWd6w4ZgtPx.png", "GsNJNwuI-UM.gif". What do these names mean? Are they using some sort of naming system (if so, what is it?) or are the names just random?</p>