Posts no longer showing up in Facebook

It’s probably Facebook. Were you using Facebook’s notes importer to bring them in automatically?

Yep, that’s Facebook. The notes importer is incredibly unreliable. Remove the blog from the importer, then add it again. You may need to clean up some duplicate notes after doing this. If it stops working again, report it here:

http://www.facebook.com/help/contact.php?show_form=import_notes