The New York Times just posted an article about anonymity and social media platforms. http://www.nytimes.com/2011/11/15/technology/hiding-or-using-your-name-online-and-who-decides.html
It reports on the increasing monitization of your personal data through a de facto passport (single password), and twin consumers desires for access and anonymity. Not a new topic for me.
In 2009, I worked with research that detailed those competing drivers to develop new opportunities for individuals and companies to work together. People had different expectations of anonymity depending on the platform they were in. Within the article they describe how different platforms require real names or encourage nyms.