I'm experiencing the following issue.
If i use the Facebook Comment box on a .info domain after i post a comment the box returns the following message:
"This comment has not yet been published to Facebook - Publish Comment"
If i click on Publish Content a new browser window is opened that allows me to post the comment on my wall.
The issue is not related to my Facebook account since if i try to add a comment on a .com domain it gets shared on my facebook wall without problems.
Do you know if there is a specific restrinction for .info domains?
If you want to simulate the issue you can try directly on the facebook comments box page:
Just set as domain a .info domain and try to post a comment and you will get the message.
Note: after i checked some extensions i found that also the .mobi extension suffer this issue while .name extension is immune