title: Sending proactive bot framework messages to Facebook Messenger
body: <p>If you use Resumption cookies to store conversation information between a user and your bot then you can initiate a proactive message. This works great for Facebook Messenger only as long as the user does not delete the conversation. </p>
  
  <p>If they do then you get a 401 error and the user needs to once again initiate a conversation.</p>
  
  <p>Is there any way to send a proactive message to a Facebook user even after they have deleted the conversation? This works fine in Skype for example.</p>