Know your friends

doi:10.1136/bmj.b293

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Jonathan A Mellon, student1

¹St Anne’s College, University of Oxford, Oxford OX2 6HS

jonathan.mellon{at}st-annes.ox.ac.uk

The findings of Fowler and Christakis, that happiness seems to spread through social networks, arise from an innovative use of the data of the Framingham Heart Study.1 However, the question still remains to what extent apparent contagion of happiness to second degrees of separation could in fact …