I wrote this up for my beloved Global Voices contributors (i.e. my job), but it applies equally to anyone authoring content on a WP site with the IA plugin running. If you are the admin for a publisher that cares about having your FB users see up-to-date versions of your content, maybe you should share it with your authors too ? ⁉
If you’re not sure what FB IA are, check out my WordCamp talk on the subject: F******k Instant Articles: How do they work?