You need to include the "Updated" date field in your mobile page version.
Your mobile site is missing the "Updated" date field. Without that, your older but updated articles look hopelessly out of date to people when you post them on Facebook as if they're new. You just posted an article originally dated March 12, and revised May 28, on Facebook, and half the people responding are demanding to know why you're posting an article more than three months old, entirely because they can't see that it's been updated since then. NOT a good look for you.