Sharebar adds a dynamic and fully customizable vertical box to the left of a blog post that can be used for adding social network buttons.
http://wordpress.org/plugins/sharebar/
Widgets · WordPress Plugins
Get access to data on 22,146 websites that are Sharebar for Wordpress Customers. We know of 3,426 live websites using Sharebar for Wordpress and an additional 18,720 sites that used Sharebar for Wordpress historically and 2,117 websites in the United States.
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Get a list of 22,146 websites using Sharebar for Wordpress which includes location information, hosting data, contact details, 3,426 currently live websites and an additional 934 domains that redirect to sites in this list. 18,720 sites that used this technology previously and 2,117 websites in the United States currently using Sharebar for Wordpress.