Not sure if a two year old report on social internet activity is reliable, but the concept of which is interesting. The Social Technographics report was developed by Forrester Research.
Many companies approach social computing as a list of technologies to be deployed as needed – a blog here, a podcast there – to achieve a marketing goal. But a more coherent approach is to start with your target audience and determine what kind of relationship you want to build with them, based on what they are ready for. Forrester categorizes social computing behaviors into a ladder with six levels of participation; we use the term "Social Technographics" to describe analyzing a population according to its participation in these levels. Brands, Web sites, and any other company pursuing social technologies should analyze their customers’ Social Technographics first, and then create a social strategy based on that profile.