title: Facebook send dialog to multiple friends using a recipients arrays
body: <p>The Facebook new Send Dialog lets people to send content to specific friends. But the API @ <a href="https://developers.facebook.com/docs/reference/dialogs/send/">https://developers.facebook.com/docs/reference/dialogs/send/</a> said the parameter 'TO' means "A user ID or username".</p>
  
  <p>I wonder is there a method to send message to multiple friends at one time. I tried to set the 'to' as a javascript arrays, but that does not work.</p>