share-page: Initial implementation

js/main.js

+(function()
+{
+  function initFacebook()
+  {
+    (function(d, s, id) {
+      var js, fjs = d.getElementsByTagName(s)[0];
+      if (d.getElementById(id)) return;
+      js = d.createElement(s); js.id = id;
+      js.src = "//connect.facebook.net/en_US/all.js#xfbml=1";
+      fjs.parentNode.insertBefore(js, fjs);
+    }(document, 'script', 'facebook-jssdk'));
+  }
+
+  function initTwitter()
+  {
+    !function(d,s,id){var js,fjs=d.getElementsByTagName(s)[0];if(!d.getElementById(id)){js=d.createElement(s);js.id=id;js.src="//platform.twitter.com/widgets.js";fjs.parentNode.insertBefore(js,fjs);}}(document,"script","twitter-wjs");
+  }
+
+  function initGooglePlus()
+  {
+    var po = document.createElement('script'); po.type = 'text/javascript'; po.async = true;
+    po.src = 'https://apis.google.com/js/plusone.js';
+    var s = document.getElementsByTagName('script')[0]; s.parentNode.insertBefore(po, s);
+  }
+
+  function sendDimensions()
+  {
+    if (window.parent === window)
+      return;
+
+    var dimensions = {
+      width: document.body.offsetWidth,
+      height: document.body.offsetHeight
+    };
+    window.parent.postMessage(dimensions, "*");
+  }
+
+  window.addEventListener("DOMContentLoaded", function()
+  {
+    initFacebook();
+    initTwitter();
+    initGooglePlus();
+    sendDimensions();
+  }, false);
+})();