Social platform evolution

In the natural world, evolution is normally a response to changes in the environment which forces adaption to the change by natural selection. If the change event is dramatic or violent life forms can become extinct before adaptive evolution can occur.

But what happens in Social Environments, Platforms, particularly virtual Social platforms. Does change and evolution happen gradually or catastrophically? And what happens to the inhabitants of that environment? Do they all migrate to the next ‘BIG THING’?

Any suggestions?