Chinese search engine Baidu.com and Facebook have already signed an agreement to introduce world's largest social networking service into China, Sohu.com reported citing a source close to Baidu.com.

It is believed the new social networking service will not be integrated completely with Facebook.com, and the timetable of the new SNS is yet to be confirmed.

However, Baidu's spokesman Kaiser Kuo told China Daily on Monday that "No comments on rumors."

Facebook founder Mark Zuckerberg was pictured touring Chinese internet companies in December last year fuelling speculation a deal was being negotiated.