If you can count on one hand, the number of close friends you have, you've probably got it right.
Oxford University anthropologist Professor Robin Dunbar reckons five is the magic number.
In addition you might have 15 "good friends", who you see for coffee or a regular catch-up, 50 people you might see casually and you might have up to 150 "meaningful contacts".
He's also studied the seven factors that are weighed up when making a potential friend, and put it all in his new book Friends: Understanding the Power of Our Most Important Relationships.
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