AppWarp/AppwarpS2 is designed for realtime multiplayer gaming engine.Although it has chat feature but it is not best suited for chat application
You can create a chat app using our App42 product.
To go about building a chat application, you can simply use App42 Push Notifications and Storage services. The messages will be sent in the form of Push notifications, and you can store the chats in our Storage service.
Users can also upload pictures, files, etc. using Upload Service. Social integration for Facebook, Twitter or LinkedIn can be done using Social Service.
You can simply start by signing up HERE.
Let me know if you have any questions.