WHEN rumours swirled in August that Baidu, a Chinese online-search giant, was buying Toutiao, the scrappy news-aggregation platform reportedly quipped in response that reports had mistaken the buyer for the seller. The firm is proud with good reason. Toutiao’s growth since its launch in 2012 has been stellar: it says it has already drawn 700m users to the personalised newsfeeds on its smartphone app.