How Did The Outbreak Start?

[2]

The whole zombie situation in Save The World. How did it all start? What's the explanation for the world being infested with those things? How did the survivors find each other? Why are things the way they are in it?
Also here's a silly question. Why do the survivors do emotes? How did they learn them? <!--td {border: 1px solid #cccccc;}br {mso-data-placement:same-cell;}-->omegle xender

[2]

Hii,

Survivors use emotes as a form of communication, entertainment, and solidarity, learning them from pre-outbreak culture, their own creativity, and interactions with fellow survivors.