In "The Subtweet," author, visual artist, musician, and university professor Vivek Shraya cuts to the heart of ambition, competition, and what it's like for a person of colour in music and art. Nam Kiwanuka talks to her about the experiences that led to writing a commentary on diversity, arts, and social media culture, and also about her mentorship of older writers through VS Books, her publishing imprint, a division of Arsenal Pulp Press.