gistfile1.js

  replaceUrl: function (elem, link, url) {
    if (url.indexOf(twitterURL) == 0 || url.indexOf("javascript:") == 0)
      return; // skip @... or #...
    } else if (url.match(/^(http:\/\/4sq.com\/\w+)$/)) {
      var _url = url;
      xds.load('http://api.embed.ly/1/oembed?url='+encodeURIComponent(url),
        function(x) {
          var p = x.thumbnail_url;
          if (!p) return;
          addThumbnail(elem, p, _url);
        },
        null, 1, 'callback');
    }
  }