New Plugin – Social Share Block, adds social network buttons
Another new plugin added to the Moodle plugins database is the SocialShare block which adds the social network buttons to your Moodle site.
Using the social share block you can add the Fb, Twitter, Google+ and StumbleUpon buttons on your Moodle site.
You can download the SocialShare block from this link in the Moodle Plugins database.The installation instructions are documented here. The block is compatible for Moodle 2.5 onwards and is developed by Sekhar Jajimoggala.