title: Deep linking to Facebook Messenger
body: <p>From a lot of searching, I found that using <code>fb-messenger://user-thread/ID</code> can be used to deep link to Messenger and open the existing thread with the passed in FB ID or start a new thread if not existent. </p>
  
  <p>It pops over to Messenger and opens a thread, but the thread is with <code>Facebook User</code> and doesn't actually send. See image below. Clicking Facebook User in the header goes to a detail view with the correct user's image and name. </p>
  
  <p>How do I make this work correctly? </p>
  
  <p><a href="https://i.stack.imgur.com/ZrX0L.png"><img src="https://i.stack.imgur.com/ZrX0L.png" alt=""></a></p>