In the part of the world where I come from and probably IN every part of the world, red signifies danger. For instance when you see a red cloth at the entrance of a building, you dare not enter without the consent of the owner of the house. The repercussion may be disastrous.
Red also signifies love, togetherness. I'm sure this is what yours depict. This is because your posts are mostly a form of comic relief and posses no danger.