各SNSのJSをまとめて読み込むやつ

gistfile1.js

<script>
/**
 * @link http://tokkono.cute.coocan.jp/blog/slow/index.php/xhtmlcss/asynchronous-loading-of-major-social-buttons/
 */
(function(w,d){
        w.___gcfg={lang:"ja"};
        var s,e = d.getElementsByTagName("script")[0],
        a=function(u,f){if(!d.getElementById(f)){s=d.createElement("script");
        s.src=u;if(f){s.id=f;}e.parentNode.insertBefore(s,e);}};
        a("//b.st-hatena.com/js/bookmark_button.js");//hatena
        a("//platform.twitter.com/widgets.js","twitter-wjs");//twitter
        a("//connect.facebook.net/ja_JP/all.js#xfbml=1&version=v2.0","facebook-jssdk");//facebook
        a("https://widgets.getpocket.com/v1/j/btn.js?v=1");//pocket
        a("https://apis.google.com/js/plusone.js");//google
})(this, document);
</script>