https://stackoverflow.com/questions/13347937/the-app-id-specified-within-the-fbapp-id-meta-tag-was-invalid
I added my page's APP_ID to fb:admins to enable every admin of my page to access Insights when logged into Facebook as Page. But when I try to save the dialog message appears:
https://stackoverflow.com/questions/8605703/how-to-verify-facebook-access-token
Dec 22, 2011 · There's only thing that server has to do; just check any access token's validity. Clients send to the server user id and access token obtained by FB.getLoginStatus.
https://stackoverflow.com/questions/5352759/how-to-embed-a-facebook-page-in-an-iframe
For my application I need to embed Facebook page in an iframe, here is the html code: