Facebook doesn't seem to understand to decode punycoded domains with OpenGraph og:url metatag
Take a look into this example - type "kämp pikset .fi" (please remove the spaces, I don't want this question to get indexed for that keyword):
https://developers.facebook.com/tools/debug/
I think this a shortcoming with Facebook's OpenGraph parsing... Is there a way around this?
Update: I have filed a problem report with Facebook.