title: Why does a new FB long-lived access token expire at the same time as the previous one?
body: <p>I have a small misunderstanding with how FB access token is being refreshed.</p>
  
  <p>I'm using FB JS SDK and every time I visit my page (as well as when I relogin) I get a new short-lived access token.
  Then I send it to the server side and exchange it to a long-lived access token.</p>
  
  <p>But despite I get a new long-lived access token, it still expires at the same time as the previous long-lived token. <a href="https://developers.facebook.com/tools/debug/accesstoken" rel="nofollow">Facebook Access Token Debugger</a> says that token, I've just got, was issued 18 hours ago.</p>
  
  <p>Is this a normal behavior? Or maybe I'm doing something wrong?</p>
  
  <p>Greatly appreciate your help.</p>