Your tribe is the set of all people that (a) you consider to be part of your tribe and (b) who consider you to be part of their tribe.

This isn’t a theoretical construct. You can actually enumerate your tribe members from your social graph.

Exercise: to what extent does your tribe correspond to national borders?

A digital tribe is a computable object.

You can start enumerating your tribesmen from your phonebook and social graph by listing mutuals.

Then ask which of them are friends with each other. Dense subgraphs are tribes.

In the example below: 14 people, 3 tribes.

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Overweight US atm. Generally cross-border and ever evolving,

Following the above mapping of weak social ties, we may want to consider depth of relationship(s).