Smiling, laughing, bursting, joyful emojis. They are super excited, because you're probably going to copy them in some post to express that you're in a good mood. People would read your message and get infected with the fun fever, because using emojis is quite contagious. That's how the emoji pandemic starts.
Here are even more smiles, so that the world becomes happy and everybody is blessed with peace and comfort. Pink poneys start shitting rainbows, the governments cancel all taxes. Well, the latter is actually not likely to happen — no emoji can trigger the change of the system, even super powerful.