On the contrary, as someone who always thought she had lots of close friends within a single friend group, I was surprised by the maximum size of our average concentric inner circles. I'll have to devote more time to my true inner circle! I also liked hearing about the mechanisms of gossip (I genuinely don't enjoy gossiping but it sheds light on dynamics within friend groups), seemingly organic close friendship replacement (rather than friendships just dissolving & leaving a gap, which I feared before reading this piece), and the infatuation thing (the statistics of friendship loss were scary - something to guard against if possible)!