title: Do Facebook has a refresh token of OAuth?
body: <p>Do Facebook has a refresh token of OAuth?</p>
  
  <p>I wanna know if there is a refresh token, how long will it be expired? 60days?</p>
  
  <p>And if Facebook don't have refresh token, then can I understand the long live access token as the refresh token, and short live access token as the access token?</p>
  
  <p>Thanks.</p>