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My site utilizes lifetime access tokens (offline_access). However, if the user changes his/her password, the access token gets reset. Is there a method to check if the current access token is valid before making calls to the Graph API? Thanks for your time.
Basically, FB wants you to poll for it, or to detect the case and redirect the user to get a reauth to occur. Annoying, but official:
(Old, out of date link. See below) https://developers.facebook.com/blog/post/500/
Edit: Facebook changed their link structure without redirects. Not surprised.
https://developers.facebook.com/blog/post/2011/05/13/how-to–handle-expired-access-tokens/