title: Integrate Facebook Audience Network and AdMob together?
body: <p>I have integrated Facebook Audience Network in my Android application but I am getting a very poor fill rate, around 40%.</p>
  
  <p>I am thinking about integrating AdMob along side Facebook Audience Network, for example when the Facebook Audience Network fails to fill an ad I'd show an AdMob ad.</p>
  
  <p>How would I achieve this?</p>