Seems like Google wants to embrace the non social networking sites to be part of social networking sites.
I see a lot of traffic to be increased to the personal or corporate websites too. All you need to do is sign up then embed few piece of code in to your website and let your friends and customers do the talking (bring the traffic back to you)
How does the traffic happen?
When ever a visitor visits a site and interact, their interactions are being reflected as updates in to the social networking sites which they belong. The updates are not mandatory, if wished, the interactions are reflected.
Corporate sites could integrate friend connect to have more authentic users
Personal websites could bring all friends buzzing among themselves and create new friends too
An approach to fight spam is unleashed.