Twitter で共有

gistfile1.js

javascript:(function(){
  var w = window,
      d = w.document,
      enc = w.encodeURIComponent,
      j = (w.getSelection || d.getSelection),
      k = d.selection,
      l = d.location,
      t = d.title,
      s = (j ? j() : (k ? k.createRange().text : 0)),
      s2 = ((s.toString() === '') ? t : (t + ' "' + s + '"'));
  w.open('https://twitter.com/intent/tweet?text=' + enc(s2) + '&url=' + enc(l));
})();