facebook manners
the rules you follow on Facebook so you don't get called out for being a total moron online.
Hey, I saw your post about your dog's bad hair day. You can't just ignore my comment about it being a disaster.
You posted a photo of your breakfast, but you didn't tag me. That's the worst kind of betrayal.
You commented on my ex's new haircut, but you didn't comment on mine. That's just rude.