Facebook Reciprocity
When you feel obligated to like or comment on someone's post just because they've been nice to you, even if their post is about their pet's hairball.
I liked your post about your dog's hairball because you liked my post about my cat's drama.
I commented on your rant about your dad just to be polite.
I liked your stupid post about your uncle's pizza because you liked my post about my mom's bunfight.