Dunbar’s Number, the theory that we are only capable of having 150 friendships at any one time, remains surprisingly robust in the digital age. Helen Coffey investigates whether ignoring in-built limits means stretching ourselves too thin, and why social media shouldn’t make us feel guilty about losing touch Stay ahead of the curve with our weekly guide to the latest trends, fashion, relationships and more Stay ahead of the curve with our weekly guide to the latest trends, fashion,