Chinese video site Bilibili has filed for a $400 million IPO, with the announcement coming weeks after market leader iQIYI revealed its own IPO plans. Bilibili is an online entertainment platform, which boasts a monthly active user base of 72 million people who flock to the site's videos, live broadcasts and mobile games. It attracts a predominantly young audience with 82% of users born after 1990. The site, which started as an online comic platform and is best known for its streaming anime content, has not disclosed timetables or pricing for the New York Stock Exchange listing.