SF GATE - Jan 24 - LinkedIn's performance since its IPO has made investors very happy. Its shares are trading at ~3x its opening day price of $45, and has almost a $13 billion market cap. LinkedIn needs to look for external growth opportunities in order to maintain that pace. Analysts say LinkedIn should consider acquiring these companies: SilkRoad, Monster.com, ChinaHR, Viadeo, Quora, DemandBase, Bizo.