The conversation that happens at work or school the day after a particularly significant status message is posted—referring to the content and either remarking on its wittiness or asking for more details. Can lead to awkward situations if someone in the near vicinity of the facebook followup is not a friend of the person who made the post.
Kyle: Man I wish Marla hadn't refused my friend request. She and Tim were having a facebook followup at the water cooler this morning and I had no idea what they were talking about.
Walter: Sucks to be you, doesn't it?