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New research explores why people are so reluctant to reconnect with friends after falling out of touch.

United statesRobert waldingerDaniel hruschkaLarab akninJean twengeMihaly csikszentmihalyiDalton conleyGillianm sandstromRobin dunbarHarvard study of adult developmentCommunications psychologyAre surprisingly hesitantOld friendsOptimal experienceSocial brainSuccessful groups