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copied!<p>As written in <a href="http://developers.facebook.com/blog/post/500" rel="nofollow noreferrer">How-To: Handle expired access tokens</a> developers blog post</p> <blockquote> <p>Access tokens for users can become invalid due to various reasons. In most cases, they can expire if it’s past the time specified by the <code>expires</code> field (by default access token have a 2 hour lifetime). What many developers do not realize is that an access token can also expire if a user changes her password, logs out or if she de-authorizes the app via the App Dashboard. It is very important that your apps handle such situations. If your access token expires, you need to reacquire a valid access token.</p> </blockquote> <p>Before we could use <code>offline_access</code> permission to get token that not expire (unless user is connected with application), this permission is now deprecated, see <a href="http://developers.facebook.com/docs/offline-access-deprecation/" rel="nofollow noreferrer">Deprecation of Offline Access Permission</a> to see how you can get <code>access_token</code> with longer expiration time.</p> <p><strong>Update:</strong><br> As of Aug 2012 Facebook PHP-SDK <a href="https://github.com/facebook/facebook-php-sdk/commit/1270f0debaab3b93d683a9817c7adbc7e9e5cdc0" rel="nofollow noreferrer">have added simple way of extending <code>access_token</code></a> (see <a href="http://facebook.stackoverflow.com/questions/8982025/how-to-extend-access-token-validity-since-offline-access-deprecation">How to extend access token validity since offline_access deprecation</a> for more details)</p> <p>Extracted from <a href="https://stackoverflow.com/questions/9060336/error-validating-access-token">here</a>.</p>

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