Complementing a central HR system implementation, products like SharePoint server can act a central hub for collaboration and information management, while Yammer can facilitate social networking and performance management, and Lync can enable VoIP, instant messaging, teleconferencing, and more.

FORBES: HR Starts With Communications And Collaboration

As for Janrain, it has a full-blown user management system, which processes huge amounts of information from sources like Facebook (NASDQ:FB), Twitter, LinkedIn (NYSE:LNKD) and Google (NASDAQ:GOOG).

FORBES: Janrain Raises $33 Million To Supercharge Social Media