Social messengers

https://www.messenger.com

Messenger from Facebook, rather than on Facebook, though, and put in a separate application.
First looked that the reason for the launch of the messenger as a separate app due to too heavy weight application Facebook, which is bad for the phone (it's not a full-fledged computer, the application needs to be compact).

In fact, the reason is somewhat different. If social networks were mostly ribbon, becomes today the main chat connection with someone, a group of ...
And after the advent of bots, the popularity of the instant messengers has grown. Because there was a separate site app. But it is still linked to Facebook and all contacts in there.

And often times just need the link and the link is maximally free and fast, why not at least make a separate icon to go to Facebook on the tape to find out how to get into messenger. Just click another icon appeared and we were there.