Temporarily disabling URL shortening with Bit.ly
[UPDATE] This is a confirmed Facebook bug. We deployed a new work around. Read details here.
Many posts with attachments have been failing for the past several hours with the message:
Facebook responded with error 100: ‘attachment-href URL is not properly formatted’.
It turns out that Facebook is rejecting URLs shortened with bit.ly. This has happened also in the past, but Facebook had fixed the issue promptly. Our guess is that they will fix it again soon.
Nevertheless, as a temporary workaround, to unblock your posts from going through, we decided to bypass URL shortening with bit.ly.
We will keep monitoring the situation and keep you updated. We will re-enable bit.ly support after Facebook resolves this issue.