The monthly unique visitors of Douban, an interest-based social network, hiked 100% from a year earlier to more than 200 million for six consecutive months from April to September this year, the company announced today. As of September 2013, Douban covers reviews on 16.70 million books, 320 million movies, 1.06 million songs, 27,000 indie musicians, and 38,000 interest groups. It has registered over 75 million users, mainly from first- and second-tier cities, with a daily average PV of 210 million. Douban grabbed 80 million yuan ($13 million) of revenue in 2012, mainly from commissions from e-commerce transactions, brand campaigns, and e-book sales. Users also can buy movie tickets in more than 500 cinemas countrywide at the Douban page of a movie.