Mark Zuckerberg wants even the people who hate Facebook to use the social network’s separate Messenger service. Users with non-Facebook accounts will enjoy the same Messenger features, including voice and video calls, payments, stickers and GIFs. Non-Facebook users will not be able to access their messages on the web. Facebook is giving a new “Not On Facebook?” option on the sign-up screen for its messaging app, which allows anyone to create an account for the Messenger app using his or her first name and number.
Source: https://thehackernews.com/2015/06/facebook-messenger-app.html