title: Facebook API "This app is in development mode"
body: <p>What does "development mode" mean for a facebook app? I find no exact explanation of what I can and can't do while in development mode and what's the relation with the "Not available to all users because your app is not live".</p>
  
  <p>Some people also refer to it as "Sandbox mode" so I have a lot of confusion between "development mode", "sandbox mode", "live vs not available to general public"</p>