title: Private chat using Firebase like WhatsApp
body: <p>I am trying to implement a private chat Android app using Firebase, but I'm stuck at the implementation of the private chat.</p>
  
  <p>I'm using this <a href="https://github.com/firebase/friendlychat" rel="noreferrer">GitHub lib</a>. This this demo is providing a group chat, but what I want to implement is one-on-one chat.</p>
  
  <p>Is this possible using Firebase or not? If yes, then how can I achieve it?</p>
  
  <p>Any help would be appreciated. Thanks.</p>