Social Essentials provides you with stats about social engagement as well as social sharing buttons to add to your posts and pages.
I am using this plugin on quite a lot of my websites, but lately there are some bugs that don't seem to be solved. It relates to the icons on Google+ and pinterest. They are supported through a cloudfront.net that don't seem to be actual anymore. If the developer wakes up again and repairs this, this plugin deserves close to 5 stars.
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