I may be missing this but it sure seems like when someone clicks on one of the share links that the content that gets pushed should be customizable. Having just the page title and url isn't a big enough call to action.
So the feature suggestion is:
ad text to share both global and per page/post.
e.g. User clicks on the Twitter link > Twitter box pops up with my content already pre populated > something like "I just got a free green widget from #hashtag - get yours quick"
They can of course change this if they want, but in most cases people will just click through and post the content the way that you want.