Facebook has stopped supporting the ability to register on Messenger without account on the largest social network.

In the past, young people users who used it application Messenger or Messenger Lite could choose to use their phone number instead of creating a new Facebook account.
So if you are new to Messenger, you will notice that you no longer need a Facebook account to chat with your friends.
The Facebook started supporting the ability to subscribe to Messenger countries social network account in June 2015, first in the US, Canada, Peru and Venezuela.
The specific change μάλλον έρχεται για να βοηθήσει σε μια επικείμενη ενοποίηση διαφόρων υπηρεσιών αποστολής μηνυμάτων του Facebook, όπως τις WhatsApp, Instagram και Messenger. Οι New York Times ανέφεραν τον Ιανουάριο ότι η τεχνική υποδομή που χρησιμοποιούν οι τρεις υπηρεσίες θα ενσωματωθεί, επαναπροσδιορίζοντας τον τρόπο επικοινωνίας για πάνω από τρία δισεκατομμύρια ανθρώπους σε όλο τον κόσμο.
WhatsApp has over 1,5 billion monthly active users, while Messenger and Instagram have over 1,3 billion and 1 billion, respectively.
In an announcement in early 2019, CEO Mark Zuckerberg mentioned Facebook's plan for a shift to encrypted, ephemeral messaging.
"Users should be able to use any of our applications to reach their friends and should be able to communicate with other networks easily and securely." mentioned on the blog.
"We intend to start by making it possible to send messages to your contacts using any of our services and then to extend this interoperability to SMS."
