System Design : Design messaging/chat service like Facebook Messenger or Whatsapp
Facebook messenger tutorial 2018
How To Video Chat On Facebook Messenger
Facebook Messaging Architecture - A Lecture By Joydeep Sen Sarma On The Facebook Messaging Structure
Facebook Messenger is a messaging app and platform. Originally developed as Facebook Chat in 2008, the company revamped its messaging service in 2010, and subsequently released standalone iOS and Android apps in August 2011. Over the years, Facebook has released new apps on a variety of different operating systems, launched a dedicated website interface, and separated the messaging functionality from the main Facebook app, requiring users to use the web interface or download one of the standalone apps.