by Facebook, Inc.
Download this app if: you want a faster way to message.
Facebook adds another app to its arsenal with Messenger — With so many social networks fighting for your attention, it seems that Mark Zuckerburg and his Facebook team have decided that an increased presence is the way to go. That can be the only explanation for the company's launch of the unnecessary iPhone and iPod touch app Facebook Messenger earlier...
Instantly reach the people in your life—for free. Messenger is just like texting, but you don't have to pay for every message (it works with your data plan).
Not just for Facebook friends: Message people in your phone book and just enter a phone number to add a new contact.
Group chats: Create...
Is it necessary? — I really don't see the point. I feel that Facebook creates additional apps just to stay relevant. Facebook Messenger is unnecessary, as I can access messages on the standard app any time. Also, I don't use FB Chat as a go-to for online communication, so yeah...