title: How to avoid the "Duplicate status message" error in using Facebook SDK in iOS?
body: <p>I want to post the several same messages onto my feed/wall in an iOS application.</p>
  
  <p>From the 2nd try, I receive this error - </p>
  
  <blockquote>
    <p>(#506) Duplicate status message.</p>
  </blockquote>
  
  <p>How can I solve it?</p>