News.com.au: Twitter’s biggest evolution might be happening without a hashtag. Last week, it announced a deal to broadcast 10 NFL football games directly on the site, once the exclusive role of a TV network. CEO Jack Dorsey calls this a “natural evolution” for the service. And it’s not an addition likely to stop at football, according to the CEO, who says Twitter is keen to investigate more broadcast rights, with live events like sporting matches and political debates topping its list.