The likes of Chunkz, Michael Dapaah, Mo the Comedian, Munya Chawawa and Amelia Dimoldenberg are just some of the YouTube stars who have slipped into the media mainstream, with appearances on comedy shows, sketches, podcasts, radio and TV programmes. And then there’s the array of sponsorship deals with big corporations like M&S and McDonalds – comedy sells. So who are the next…