Considering the backlash against Slack [0], it’ll be interesting to see if Messenger’s model of more “atomic” conversations will create less interruptions. Slack (much like IRC) really contributes to an expectation of continuous conversation throughout the day/night (although not all people deal with it that way). In comparison, Messenger (and other chat apps like WhatsApp, iMessage, etc.) seem to be more designed to…
It's just a dumbed down version of Messenger, and I don't think a team in my company want to use it, Slack is much better and worth learning. After several months we're just using it as another Viber/Whatsapp/etc..