Visit the nicer page at http://davidchang.github.io/angular-facebook-utils/ for more details.

1. bower install angular-facebook-utils
2. <script src="proxy.php?url=https%3A%2F%2Fgithub.com%2Fbower_components%2Fangular-facebook-utils%2Fsrc%2FfacebookUtils.min.js"></script>
3. angular.module('facebookUtilsDemo', ['facebookUtils']);
4. <facebook-login-button></facebook-login-button>

I took code and ideas from these 3 places, so they deserve more obvious credit:

http://blog.brunoscopelliti.com/facebook-authentication-in-your-angularjs-web-app

https://github.com/Terumi/AngularJS-Facebook-Login/blob/master/js/app.js

https://github.com/necolas/css3-social-signin-buttons

http://davidandsuzi.com