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As popularised in Malcolm Gladwell’s book ‘The Tipping Point’, ‘Dunbar’s number’ is a theory suggesting each of us can only maintain stable relationships with a maximum of 150 other people (i.e. meaningful contact once a year minimum) at any one time. What’s more, the theory is now backed up by Facebook. The social networking juggernaut reports the average user has 130 friends, which slots nicely into Dunbar’s average range of 100-150 meaningful relationships per person.