title: nodejs passport - facebook authentication
body: <p>I have created a facebook app and was used by only me. Now I have made it live but nobody else than me is able to login.</p>
  
  <p>They get following error.</p>
  
  <pre><code>FacebookTokenError: This authorization code has been used.
   at Strategy.parseErrorResponse (/var/www/html/project/node_modules/passport-facebook/lib/strategy.js:199:12)
   at Strategy.OAuth2Strategy._createOAuthError (/var/www/html/project/node_modules/passport-facebook/node_modules/passport-oauth2/lib/strategy.js:345:16)
   at /var/www/html/project/node_modules/passport-facebook/node_modules/passport-oauth2/lib/strategy.js:171:43
   at /var/www/html/project/node_modules/passport-facebook/node_modules/passport-oauth2/node_modules/oauth/lib/oauth2.js:177:18
   at passBackControl (/var/www/html/project/node_modules/passport-facebook/node_modules/passport-oauth2/node_modules/oauth/lib/oauth2.js:123:9)
   at IncomingMessage.&lt;anonymous&gt; (/var/www/html/project/node_modules/passport-facebook/node_modules/passport-oauth2/node_modules/oauth/lib/oauth2.js:143:7)
   at IncomingMessage.EventEmitter.emit (events.js:117:20)
   at _stream_readable.js:920:16
   at process._tickCallback (node.js:415:13)
  </code></pre>
  
  <p>What could be the issue here. App is live.</p>