[RB] Small UI fixes

* Change some `<title>` tags content
* There was some html code in the wrong template block `extra_script` which is reserved for extra javascript. In those cases that code was put after `<footer>` which is bad.
* Social dropdown menu has been added
![screenshot from 2014-12-19 09 57 16](https://cloud.githubusercontent.com/assets/1818657/5502113/a5e81b42-8765-11e4-8fe1-4ae88709b250.png)
* Explore content has been updated