Facebook Deploys Salesforce.com's Rypple Throughout the Enterprise

I think this has major implications on the HR industry and it doesn't hurt that the largest social network in the world has adopted your platform. Salesforce's new tool Rypple is an internal social performance management tool that brings the enterprise together. Could this be another blow to enterprise email? How do those of you in the HR world feel about their encroachment into providing HR solutions? Do you see this as a threat?

http://www.youtube.com/watch?v=5RaRrqSkiM0