Cisco starts its acquisition game , now in social networking space. Its recent acquisition is
Five Across 

About the firm
Five Across is a leading provider of social networking and community building technology that helps organizations ranging from small businesses to large enterprises connect to their community constituents and customer base. Connect, the company’s flagship product, is a rapid-deploy web platform enabling organizations to strengthen and grow user communities with dynamic multimedia experiences. Organizations using Connect can grow user demographics within their brand and build a profitable business model with on-demand and user-generated content.