social toolbar tweaks

Made some minor mods to reduce noise induced by social toolbar.

Should look something like:

![image](https://cloud.githubusercontent.com/assets/1341391/4362179/132a062c-428b-11e4-96a9-cf7aecf8deef.png)

'Share this' label is no longer used and has been removed from view and style guide. 'Send this' is retained as those icons are less obvious.
you have this rule duplicated