Snowball is an all-in-one messaging app (Android only for now) that will show messages from Facebook, Whatsapp, SMS, and others.
I had a draft to post about an all-in-one messaging app because I find it annoying that I have use Viber to chat with my cousins in the Philippines and Whatsapp to chat with my family in England, and Facebook Messenger for other people. It looks like Snowball will solve this issue and I am sure other apps will follow to provide the same thing.
They just need this for iOS.
(via MG Siegler)