A tweet by Barack Obama condemning racism in the aftermath of a far-right rally in Charlottesville, Virginia, has become the most liked tweet ever, with over three million people endorsing the sentiment so far. The tweet, quoting the late South African president Nelson Mandela, read, ‘No one is born hating another person because of the colour of his skin or his background or his religion.’ The former US president followed the tweet with more from Mandela’s autobiographical Long Walk to Freedom: ‘People learn to hate, and if they can learn to hate, they can be taught to love. For love comes more naturally to the human heart than its opposite.’ Each has had more than a million likes, and hundreds of thousands of retweets.