Also separating LinkedIn from other social networks is the fact that it has diverse revenue streams, driven by three customer segments: job seekers who buy premium subscriptions for access to special services; advertisers who rely on its marketing solutions unit; and corporate recruiters who buy special search tools from its talent solutions unit. Today, LinkedIn has more than 300 million users worldwide—including 5 million in China, one of its newer markets—and sees much growth from its mobile users, who in 2013 accounted for more than 30 percent of unique visits to the site. Now LinkedIn’s well-targeted and positioned brand faces competition from other online giants, such as Facebook, and from established professional network services overseas, such as Viadeo SA in Europe and elsewhere.