This relates to evolution of social groups via aposyndesis
by Douglas Moreman
Every social group of humans has its proper language, its synglot.
This can be taken in a very watered-down sense, being true because it can hardly not be true:
Given such a weak meaning to synglot, what might become interesting is a study of different kinds or measures of synglots. Some synglots have elements that, upon experience with them, are attention-getting and suggestive of existence of a group that has that synglot. Religions are like this. New cults of all sorts have synglots.