China's version of Twitter, Sina Weibo, crashed after former EXO boy band member Luhan announced his new girlfriend, drawing heated discussion by fans, Chinese media reported.
The 27-year-old Chinese singer and actor posted on the social media platform at noon on Sunday (Oct 8), writing in Chinese: "Hi everyone, let me introduce her to everyone - this is my girlfriend @Guan Xiaotong."
His message has been liked more than 4.8 million times and drawn more than 2.3 million comments.
Guan, also known as Traey Miley, is a 20-year-old Chinese actress.
The pair are co-stars in upcoming romantic comedy Chinese television series Sweet Combat.
The announcement sent Weibo into overdrive, with traffic soaring to record levels, the South China Morning Post reported.
Weibo said in a statement at 12.32pm that its engineers were working to handle the increased traffic, Lianhe Zaobao reported. Service resumed fully only around 2pm.
Some fans reportedly reacted badly to the news, breaking down and even being taken to hospital, Lianhe Wanbao reported on Monday.
However, others speculated that it could be a marketing ploy for the show.