Facebook is currently the largest social network in the world, and there are numerous Facebook clients that allow users to connect to the platform without launching a browser first.
There are also various applications that can be used to engage in conversations with one's Facebook friends.
In order to start chatting, users only need to enter their credentials in the dedicated window and to have a stable Internet connection.
Some popular instant messengers also support Facebook chat, but there are also numerous third-party tools that can only perform this type of chat.