The problem is with Visual Composer plugin.
You need edit the file js_composer_front.js in the directory wp-content/plugins/js_composer/assets/js. Find the link http://assets.pinterest.com/js/pinit.js in line 121 and change it to //assets.pinterest.com/js/pinit.js.
Then edit a link the same way in the file wp-content/plugins/js_composer/include/templates/shortcodes/vc_tweetmeme.php in line 25. Also the file wp-content/plugins/js_composer/include/templates/shortcodes/vc_facebook.php in line 26.