In this CoP Show we look at Twitter, the microblogging service used worldwide by an estimated 190 million users. Simon Smith hosts the discussion on how Twitter can influence programmes and brands, what it offers and how to do it better. Joining him is champion of Twitter and Father Ted creator Graham Linehan; journalist Alex Hudson who looks after BBC Question Time's Twitter feed; and comedy writer Steve Saul more famous as the Twitter voice of the X-Factor.