Who is participating in social media and how

Thanks to George Siemen for highlighting this chart from Business Week, showing participation in social media in the US

Another Business Week chart shows that although use of social media has grown enormously, creation of content is still the domain of the few

In the 22+ age range, there are more commenters and readers than there are creators (those who write blogs, publish web pages, upload videos.

This is reflected in terms of my research, in that there are more readers and commentors than creators.