Cryptocat is an open source web application intended to allow secure, encrypted online chatting. Cryptocat encrypts chats on the client side, only trusting the server with data that is already encrypted. Cryptocat is offered as an app for Mac OS X or as a browser extension for Google Chrome,Mozilla Firefox and Apple Safari.

If you are a user of Facebook, Twitter and any other Messenger user then for your privacy you must go for it. For detail views on it do watch the below video.