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Zuckerberg Plans To Integrate WhatsApp, Instagram and Facebook Messenger (nytimes.com)
Mark Zuckerberg, Facebook's chief executive, plans to integrate the social network's messaging services -- WhatsApp, Instagram and Facebook Messenger -- asserting his control over the company's sprawling divisions at a time when its business has been battered by scandals.
The New York Times: The move, described by four people involved in the effort, requires thousands of Facebook employees to reconfigure how WhatsApp, Instagram and Facebook Messenger function at their most basic levels. While all three services will continue operating as stand-alone apps, their underlying messaging infrastructure will be unified, the people said. Facebook is still in the early stages of the work and plans to complete it by the end of this year or in early 2020, they said.
Mr. Zuckerberg has also ordered all of the apps to incorporate end-to-end encryption, the people said, a significant step that protects messages from being viewed by anyone except the participants in the conversation. After the changes take effect, a Facebook user could send an encrypted message to someone who has only a WhatsApp account, for example. Currently, that isn't possible because the apps are separate.
The New York Times: The move, described by four people involved in the effort, requires thousands of Facebook employees to reconfigure how WhatsApp, Instagram and Facebook Messenger function at their most basic levels. While all three services will continue operating as stand-alone apps, their underlying messaging infrastructure will be unified, the people said. Facebook is still in the early stages of the work and plans to complete it by the end of this year or in early 2020, they said.
Mr. Zuckerberg has also ordered all of the apps to incorporate end-to-end encryption, the people said, a significant step that protects messages from being viewed by anyone except the participants in the conversation. After the changes take effect, a Facebook user could send an encrypted message to someone who has only a WhatsApp account, for example. Currently, that isn't possible because the apps are separate.
You can't subscribe to whatsapp withtout a phone number that can receive an SMS. You can't login to whatsapp on two phones at the same time.
You can't use whatsapp from your PC without having it installed on your phone first. And I think your phone must even be on and with an Internet connection so that your PC can send a whatsapp message.
Facebook messenger doesn't have any of these limitations.