The age of envy: how to be happy when everyone else's life looks perfect

Social media has created a world in which everyone seems ecstatic - apart from us. Is there any way for people to curb their resentment?

One night about five years ago, just before bed, I saw a tweet from a friend announcing how delighted he was to have been shortlisted for a journalism award. I felt my stomach lurch and my head spin, my teeth clench and my chest tighten. I did not sleep until the morning.

Another five years or so before that, when I was at university, I was scrolling through the Facebook photos of someone on my course whom I vaguely knew. As I clicked on the pictures of her out clubbing with friends, drunkenly laughing, I felt my mood sink so fast I had to sit back in my chair. I seemed to stop breathing.