LinkedIn (NYSE: LNKD), the professional networking site, expects increased mobile usage next year. In order to take advantage of this increased traffic, LinkedIn has updated its applications and partnered with Apple to integrate LinkedIn into Apple's email program.

LinkedIn pointed out the reason for this: Mobile users are simply more engaged. Mobile users are more than twice as active as those who only visit from personal computers. What are the implications for this high-flying company to have a more engaged user base?

Also, social-media companies are trading at very high valuations, particularly on a price to earnings ratio. What are the risks of valuing these growing companies on merely a price to earnings ratio? Finally, find out if LinkedIn is in Evan Niu's portfolio.

In this segment of Tech Teardown, Erin Kennedy discusses LinkedIn's aggressive mobile moves with Jamal Carnette and Evan Niu, CFA.

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LinkedIn is growing twice as fast as Google and Facebook, and more than three times as fast as Amazon.com and Apple. Watch our jaw-dropping investor alert video today to find out why The Motley Fool's chief technology officer is putting $117,238 of his own money on the table, and why he's so confident this will be a huge winner in 2013 and beyond. Just click here to watch!

Erin Kennedy owns shares of Apple. Evan Niu, CFA, owns shares of Apple and LinkedIn. Jamal Carnette owns shares of Apple and Facebook. The Motley Fool recommends Amazon.com, Apple, Facebook, Google, and LinkedIn. The Motley Fool owns shares of Amazon.com, Apple, Facebook, Google, and LinkedIn. Try any of our Foolish newsletter services free for 30 days. We Fools may not all hold the same opinions, but we all believe that considering a diverse range of insights makes us better investors. The Motley Fool has a disclosure policy.