michaelbeacom

Displays the social widgets from Facebook, Twitter, Google+ and Pinterest with your posts. It also adds some meta tags for opengraph and schema.org as recommended by Facebook and Google. The standard method to do this is by filtering the content of the posts, which is controlled by the options in the admin menu. Buttons can also be displayed by the shortcode [sic] with ability to disable individual buttons for that instance of the shortcode. You can also add it to your theme with do_action(‘sic_sharing’); where you want it to render.
Allows some custom text and css insertion as well as most options for the buttons in the admin page. Compatible with html5 (optional).

Sharing is Caring

Displays the social widgets from Facebook, Twitter, Google+ and Pinterest with your posts. Also adds some meta tags for opengraph and schema.org.

straps

Dynamic widget to insert classic social buttons and counters on your sidebar. 
Title changes based on page type users are visiting (Home, pages and posts). 
Insert a comma separated list of social sites in the order you want and start sharing. 
Play with all of the configuration options to reach the best visual appeal. 
Never forget to share your posts anymore and start increase visitors for your web site. 
Internationalization support via widget admin added.
See also: <a href="http://www.strx.it/2010/11/simple-sharing-wordpress-widget/" rel="nofollow ugc">Official Blog Post</a>.

Strx Simple Sharing Sidebar Widget

Dynamic widget to insert classic social buttons and counters on your sidebar.

Sharing is Caring vs Strx Simple Sharing Sidebar Widget