Facebook (NASDAQ:FB) and LinkedIn (NYSE:LNKD) are now at all-time highs, despite all the skepticism both have garnered over the past few years. Social networking isn't necessarily a zero-sum game, though, and there can be multiple winners. 

However, LinkedIn may face different challenges with international expansion, as its core recruiting business may not be as successful in other countries as it is stateside. Trading at such incredibly high valuation multiples means LinkedIn will inevitably be susceptible to volatility and investors should expect plenty of risk.

In the following video, Erin Kennedy discusses social-media players with Evan Niu, CFA, and Eric Bleeker, CFA.

Neither Eric Bleeker, CFA, nor Erin Kennedy has a position in any stocks mentioned. Evan Niu, CFA, owns shares of LinkedIn. The Motley Fool recommends and owns shares of Facebook, Google, and LinkedIn. Try any of our Foolish newsletter services free for 30 days. We Fools don't 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.