END TO END ENCRYPTION...

Don't you think it's a great development?

Facebook last week said it would begin testing
long anticipated end-to-end encryption
capabilities in its Messenger app, enabling users
to have secret conversations.
The new level of security means that a message
will be visible only to the sender and the
recipient -- Facebook won't even be able to read
it.
Users can set a timer to limit the amount of time
that a message remains visible during the
conversation. Facebook has employed Open
Whisper Systems' Signal Protocol technology to
provide the encryption.
One major caveat is that an end-to-end
encrypted conversation can not be viewed on
multiple mobile systems at the same time --
however, the encryption is an optional feature.
Many users want to be able to switch devices
during a conversation -- for example, move from
a mobile phone to a tablet or desktop computer.
With the current technology, secret conversations
can be read only on one device.
In addition, sending rich content like GIFs or
video and making payments will not be possible
using the encryption.
E2E Justification
Some of the security protocols related to the
end-to-end encryption have raised questions
among Messenger users.
All secret messages are encrypted in local
storage with two keys and the remote key can be
revoked.
Further, it's likely that an update to end-to-end
encryption will allow it to support multidevice
use, which is how millions of Facebook
Messenger users currently operate.
Hundreds of millions of Messenger users talk
Web-to-Web, but there is currently
no secure way to store code or verify keys
without using mobile technology.
The provision of end-to-end encryption serves
two important uses for Facebook amid a robust
debate about consumer privacy and security
protocols around the world.
"First, it will help Facebook appear to be on the
side of the digital consumer; and secondly, it
allows the company to inhabit the same ethical
high ground that has hitherto been the preserve
of Apple regarding the privacy of its users,".

Note however that Facebook hasn't cut off the Web version of messenger but now offers a dual system in which users can still use the Web version without the End to End Encryption.