I hear about this plugin on my friend  Social Warfare plugin (http://weeklywebtools.com/socialwarfare)  unique in a few ways.

(http://weeklywebtools.com/socialwarfare) It only focuses on Facebook, Twitter, Pinterest, and LinkedIn. (but really, do you use others?)

You can dictate what image is shared on FaceBook

You can completel control what is tweeted out including hastags, mentions, etc

The retweet button looks awesome (pull quote)

Customize the description and picture of Pinterest.

The price is $24/yr for one website. 

I have not purchased this plugin yet, but probably will be in the future. 

Also, I recently moved Weekly Web Tools to BlueHost just to try them out. I'll keep you posted.

For more information visit 

Social Warfare  (http://weeklywebtools.com/socialwarfare)