The Chinese subsidiary was registered in Hangzhou, home of e-commerce giant Alibaba Group Holding Ltd, according to a filing approved on China's National Enterprise Credit Information Publicity System last week and seen by Reuters on Tuesday.

"We are interested in setting up an innovation hub in Zhejiang to support Chinese developers, innovators and start-ups," a Facebook representative told Reuters via email, referring to the Chinese province where Hangzhou is located. Facebook has created similar hubs in France, Brazil, India and Korea to focus on training and workshops, the spokesperson said.

The news quickly sent FB stock soaring, hitting a new all time high.