Messenger, WhatsApp, Instagram…what are they used for?
It allows group chats and video calls.
As of April 2016, Messenger has 900 million users.
WhatsApp is another app that was built independently but acquired by Facebook. It is a chat app fulfilling broadly the same functions as Facebook Messenger, allowing group chats where photos, audio recordings and media can be accessed, as well as video and voice calls.
WhatsApp has less added extras, while Messenger offers the ability to share gifs or videos directly from other sites.
As of February, WhatsApp has over 1 billion monthly active users.
Instagram is another app owned by Facebook which, as of September 2015, had 400 million monthly active users. Instagram is essentially a social network for images, allowing users to share photos and videos to followers.
For those who don’t want to download specific apps for these services, there are also web-based versions that are also accessible on mobile. For example, the Facebook site can be accessed directly though a mobile browser, giving access to Messenger as well.