If you’re looking for a Facebook-like theme for Moodle look no further: Moodlebook by Julian Ridden has been updated and released for Moodle 2.4.
This theme has all the familiar blue, white and grey tones and a top horizontal navigation bar to help organize menus and links. Download the updated release from https://moodle.org/plugins/view.php?plugin=theme_moodlebook. See it in action on Moodle 2 at http://playpen.moodle.com.au/moodle20/.