The official Facebook app has seen a minor update to version 2.6.
Unlike when Microsoft update their apps, Facebook has not left us guessing as to what has changed, which is good, since the changes are pretty small.
1. An image posted to a group was appearing on your own wall rather than the group
2. Users with custom privacy settings set as their default were having their updates created with "Only Me" permissions
The fix is in response to messages of complaint, so at least we know they are listening. The update can be found in Marketplace here.