[gh-pages] Demo page: Social buttons.

Please align buttons: 

![screen shot 2016-10-31 at 15 02 31](https://cloud.githubusercontent.com/assets/11623226/19873232/1af40e62-9f7b-11e6-9823-02855754ddc8.png)
![screen shot 2016-10-31 at 14 56 02](https://cloud.githubusercontent.com/assets/11623226/19873233/1afaa416-9f7b-11e6-85af-af32004c71ae.png)
