In some cases the plugin causes js errors due to tabs and sortables in wp admin. To avoid that the admin.js script should be loaded by providing the dependencies instead of wp_enqueue_script.
This piece of code (on line 135 in social_sharing_toolkit.php) solves the problem:
wp_enqueue_script('mr_social_sharing-admin', plugins_url('/admin.js', __FILE__), array('jquery-ui-tabs', 'jquery-ui-sortable'));
A much better approach would be to load the scripts only on the admin page of the plugin. Currently they get loaded all over wp administration area. Other than that, nice job, congrats.