The latest Sociable WordPress plugin ver. 4.3.0 is missing the shortcode registration code in sociable.php.
When the shortcode is inserted in a WordPress post or page the resulting page only shows the actual shortcode , [ sociable /], and not the social icons. Here is the fix for it until the developer updates the plugin:
Under the line add_filter( ‘the_excerpt’, ‘auto_sociable’ ); in the sociable.php file (found under content/plugins/sociable/),
put this line:
add_shortcode( ‘sociable’, ‘sociable_shortcode’ );