Nearly 10 million users of China’s pioneering video-sharing platform may have had their personal data hacked, the company said in a statement Wednesday.

AcFun emailed its users — including Sixth Tone’s reporter — advising them to change their passwords, and said it has organized a security team to investigate the problem and upgrade safety measures. “In the case of this severe accident, the fundamental reason is that we didn’t make AcFun safe enough. For this, we must sincerely apologize to you,” the company said, addressing its users.

Founded in 2007, AcFun was the first video-sharing site in China to feature now-ubiquitous “bullet screens.” Facing stiff competition from rivals like Bilibili, AcFun was on the verge of bankruptcy before being bought by Kuaishou earlier this month. (Image: IC)