Download this app if: you want a faster way to message.
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...
Chatterbox — Although Facebook chat is an important communication tool for my daily life, I don't see much need for this app.