An issue with Facebook affected an unknown number of people Thursday afternoon (April 30), with many saying their previous status updates disappeared.

Facebook brand pages were also impacted, with many websites unable to post links to articles. Previous articles posted to their pages vanished. The issue also affected articles scheduled for publication. Our own website's Facebook page was impacted by this issue.

changed to the Graph API v.2.0 Thursday, and, according to the Twitter page 
Social Flow, the problem was indeed the result of the changeover:

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