Deep linking to Facebook Messenger

Question

From a lot of searching, I found that using fb-messenger://user-thread/ID 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.

It pops over to Messenger and opens a thread, but the thread is with Facebook User 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.

How do I make this work correctly?

Answer 1

Sorry to bring this back from the dead, but it seems that Facebook Messenger has incorporated Universal Links to quick open the Messenger app.

m.me/$USERNAME

for example: http://m.me/zuck will universally link you to message Zuckerberg.

I played with a couple params, but nothing seemed to prefill the message.