Improve social wording

![screen shot 2014-03-29 at 13 25 31](https://cloud.githubusercontent.com/assets/10737/2557431/a742ab58-b702-11e3-9f95-290cb84ce7b0.png)

1. Added texts to twitter sharing. Feel free to improve the wording.
2. Added hashtag "#CongressOccupied" to the text of twitter sharing.
3. Added hashtag "#CongressOccupied" to the sidebar of sharing block.
4. After shared on Twitter it will show related twitter account "4amtw".
5. Fix wrong twitter account name on "We need your support" page.