Facebook’s Messenger app is growing up. Since you no longer need a Facebook account to use Messenger, it has now morphed into its own service. Messenger now offers texting (MMS and SMS), phone and video calling, Uber, shopping and the list is still growing.
Also, with a simple scan of your phones you can add a contact free of the Facebook app or web site. Messenger even has its own web site, separating it even further from Facebook proper.
If nothing else, Facebook as a company knows how to stay relevant.