Add social networks

Adding social networks to the home page. Obviously needs design work.

Work in progress, I think I can clean up the code a lot. But @venetucci if you want to get started designing some of this, we can merge it and I can clean it up in a separate PR.

![screenshot 2014-11-24 16 23 42](https://cloud.githubusercontent.com/assets/829576/5175959/beb4d26e-73f6-11e4-91c4-2fbbbd708254.png)