Update on Short URLs issue
The issue that has been reported earlier today, causing posts to fail if they contained attachments with shortened or redirected URLs, is indeed a Facebook bug that affects every application that uses this feature.
In response to this issue we just deployed a workaround on our servers that will allow your posts to go through until Facebook fixes the issue. Now RSS Graffiti instead of shortening URLs it actually tries to expand (un-shorten) them. This effectively bypasses the Facebook issue.
At the moment of writing this, Facebook is also rolling-out a fix. We will keep our workaround in place until the fix by Facebook is confirmed.
For details on the bug see Bug 14832 on Facebook’s bug tracker.