You can use this simple filter to hide and show specific social networks on specific positions. In the given example we are showing only the Pinterest network on media.

function on_media_buttons ( $networks ){
  unset( $networks['fbshare'] );
  unset( $networks['twitter'] );
  unset( $networks['reddit'] );
  unset( $networks['viber'] );
  unset( $networks['fblike'] );
  unset( $networks['linkedin'] );
  // If you only want to keep the pinterest buttons on media. unset all other networks. 
  return $networks;
} ;

add_filter('ssb_popup_social_networks', 'on_media_buttons') ;