Adds Facebook logo

Author: Ralf Grubenmann

index.md

@@ -66,6 +66,7 @@ Check out our <a href="https://mlbench.github.io/blog/">blog</a>!
         <li><img src="{{ site.baseurl }}public/images/Logo_EPFL.png" alt="EPFL" style="max-width:200px;border-radius:0px;"/></li>
         <li><img src="{{ site.baseurl }}public/images/pwc_logo.png" alt="PwC" style="max-width:200px;border-radius:0px;"/></li>
         <li><img src="{{ site.baseurl }}public/images/google.png" alt="Google" style="max-width:200px;border-radius:0px;"/></li>
+        <li><img src="{{ site.baseurl }}public/images/Facebook-Wordmark-Gray.png" alt="Facebook" style="max-width:200px;border-radius:0px;"/></li>
     </ul>
 
 </p>