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Joseph Chen, chief executive officer of Renren Inc

The company has come under pressure amid rising competition in China's social-networking space. It's also struggling to adapt to the rise of smartphones and mobile internet users.

Renren's net revenue declined 29 percent on year to $30.7 million in the final quarter of 2013, and it has warned investors to expect further declines in the current quarter.

While users spend 80 percent of their time on Renren via mobile devices, mobile makes up less than 10 percent of the company's online advertising revenues.

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During the fourth quarter, its online ad revenue tumbled 18 percent on year amid increased competition and continued migration of user traffic to mobile devices from desktop computers.

Chen said companies in the mainland are taking a lot longer to adapt their advertising strategies to the mobile platform.

He added that the companies need to figure out a way to monetize beyond advertising.

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Excerpt from:
China's 'Facebook' CEO unfazed by stock drop