Varies with device
Facebook Messenger is a desktop window chat client that allows customers to chat, receive notifications and read what's new from their computer desktop.
On Nov. 10, 2014, Facebook said its Messenger app has more than 500 million users. Beginning in April, Facebook asked users to download a standalone Messenger for the ability to send videos and text messages to friends and make Internet calls. At the time of its launch in April, Messenger had just over 200 million users. And only six months later, the app is now used by more than 500 million people. As of July 20, 2016, the Facebook Messenger app has more than 1 billion users.
Persistent access to chat increases user engagement and also entices their friends to spend more time on Facebook.
Persistent access to notification methods, information methods, and friend requests can help more users return to the site to view notifications.
When Facebook first launched Messenger, the Internet did not think much of this feature, but until now, I must say that Messenger has brought a lot of convenience to Facebook's communication system and has become one of the irreplaceable communication software in recent years. If this chat function is integrated into the Facebook app, then every time we chat, we have to sign in to Facebook, so we will actually spend more time on chatting. If you take a closer look at the Facebook app you will find that this app is actually possible without chatting with your Facebook friends. That is, when you see a person you want to know but directly ask the phone and Facebook and a little too awkward, in fact, directly add a messager friends on the good. This way the contact information is also available, their own circle of life will not be broken. It's the best of both worlds, isn't it?