Yes, I actually wrote this post on that subject. http://bit.ly/2hngmmr I've seen so so results so far. It's clear that Facebook is working on finding ways to increase people messaging in. 1. I think there will be new best practices on top of new targeting for this destination.

2. I'm genuinely interested to hear other success stories and learnings. Are people finding that Messaging apps are 'build it and they will come' or are there new techniques for driving usage?