Primates have a tendency to be social animals: they live in a herd and
need to communicate frequently with its members to cohordinate their
activities but also to maintain the social ties that keep the group
together.

Since a long time, human herds have developed technological tools that
helped them to spread out their herds geographically by enabling remote
communications with fellow human beings.

With the speed of modern technlogical advancements and aided by the natural
lifecycle of standards, this has led to the proliferation of chat systems
famously illustrated by xkcd_

.. _xkcd: https://xkcd.com/1810/