I am doing a facebook canvas project. But now, I do really hope that someone can do me a favour, because I think I am facing a problem which might be related to the "access token". The situation is I have to login to my app again and again after every hour, it seems that the access token will be expired in an hour after you login (actually I really don't know how to extend it), and I'd searched on Google.com and stackoverflow.com, but still can't get the answer I want, so I hope that someone can solve my question.
Many thanks and have a nice day.