

The world's largest social network is rolling-out group voice-calling within its Messenger app today, globally.
Facebook Messenger users will be able to make conference VOIP calls with up to 50 other people.
To make use of the service, users will have to start a group-chat on Messenger with those they wish to call. From within that chat, users tap the phone icon in the top right corner to initiate a group-call. In the next screen, users choose who they would like to be within the call.
During a group call, a list of all people within the group chat will appear with the option of 'ringing' them in at a later stage in the conversation.
"If you have the latest version of Messenger, you should see the phone icon appear in group conversations within the next 24 hours," Facebook head of Messenger, David Marcus, said on his page.
The mobile messaging service has over 900 million users.
In 2013, Facebook introduced voice messaging, where users were able to send each other voice clips up to one minute long, but not speak in real-time. The following year, one-on-one voice calling was made available through the Messenger platform.
Last year, the social network introduced video calling to the Messenger platform. Skype and Google Hangouts already offer similar services. Facebook has not said when video group calling will be available.
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