I can't get the opengraph properties working in an iframe canvas of a Facebook app.
I used the Facebook URL Linter to test.
What I did to slim the problem down:
1) create an HTML page (test.html) with OG properties
2) When I 'add' this page as an iframe to another page (frame.html).
--> No OG properties found.
How to solve this problem?
Use the solution here: http://forum.developers.facebook.net/viewtopic.php?pid=354148#p354148 It worked for me