Facebook Messenger vs Viber


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Facebook Messenger
Facebook Messenger is an instant messaging service and software application which provides text and voice communication. Available now for Android and iPhone. Secure Facebook Messenger alternatives are Signal and Telegram. If you are looking for Facebook Messenger alternatives for business pay attention to GoToMeeting, Skype for Business.
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Viber
Viber is a mobile app that provides free international calls and text messages to other Viber users using 3G or Wi-Fi. Uses your existing contact list - check out which of your phone contacts and friends is already on Viber so that you can call and text them for free.
Viber has better video than Facebook Messenger



2016 - Facebook Messenger gets group video calling to keep up with Viber



Facebook Messenger just added group video calling. The chat app now allows groups of up to six users to make video calls directly from their messages. The feature, available now to anyone with the latest version of the app. Starting a group call works the same way as it does for one-to-one video calls in the app: tapping the camera icon in the top right corner while in a chat will begin the video call. Facebook has limited the calls to groups of six, though up to 50 other participants to join in without video once the limit is reached. Recall that Messenger's bro WhatsApp added only one-to-one video calling last month.

2016 - Viber launched Public Accounts for businesses to keep up competition with Facebook Messenger


Messaging app Viber is launching Public Accounts for businesses and brands who want to communicate with Viber users for marketing, customer service - or a bit of both, without a user needing to add that account as a contact first. Instead they can justsubscribe to them. Besides, by the end of November, Viber’s API will be integrated with between 10 and 15 popular CRM packages for customer service integration. Businesses can then send and read their Viber messages alongside all of their other social media, email and messaging interactions. Public Accounts puts Viber among several other consumer-focused messaging apps that already  have similar feature: WeChat, Line and Facebook Messenger.