「There were rumors that Facebook was going to make its messaging products interoperable, but now it appears they're about to be a reality. At F8, Messenger's head of consumer product Asha Sharma said that in the future, users will soon be able to send messages across Facebook's three different messaging platforms: Messenger, Instagram and WhatsApp.
This interoperability is just one of many features of the new Messenger. All messages will also be end-to-end encrypted, which is part of Facebook's recent privacy-focused mantra. Sharma said that the inter-app messaging will work similar to how people make calls on phones today. You don't need to know if your friend is on Verizon or T-Mobile, you can just call them. It'll be the same on any of Facebook's messaging services -- just say you'll want to talk to your friend, and that message will get to him or her on whatever service they use.
"We believe people should be able to talk to anyone anywhere," she said.
It's unclear just yet when this will roll out to users, but it sounds like it'll be some time this year.」
In short, Facebook is making three of its messaging apps interoperable. Whatsapp has 'end-to-end encryption' but Instagram and Messenger do not. So its either that Instagram and Messenger gain end-to-end encryption or Whatsapp drops their encryption so the three messaging apps are interoperable. While many people will see this as good - I see this as worse when looking at the big picture. The walled garden has grown just a little bigger but with consequences. Your personal information and data will not be stored in just one messaging app - But it will also be shared with other messaging apps. There will now be more copies of data of everything that will be backed up and never deleted. Since these three messaging apps are proprietary we can't verify and audit everything that is going on behind the scenes. Though if anyone actually cares about privacy they wouldn't be using any of these messaging apps to begin with.. XMPP+OMEMO is currently the best option right now if you want a truly secure and private encrypted text chat.
Might revisit this article in the future as I don't feel satisifed with what I wrote or it feels like gibberish..