2 1/2 years ago Charlene Liu and Josh Bernoff introduced Social Technographics. At the time they wrote:
"At the heart of Social Technographics is consumer data that looks at how consumers approach social technologies – not just the adoption of individual technologies. We group consumers into six different categories of participation – and participation at one level may or may not overlap with participation at other levels. We use the metaphor of a ladder to show this, with the rungs at the higher end of the ladder indicating a higher level of participation."

They have just released a new graphi, detailed in a recent Groundswell blog posting stating
"As you can see from the graphic, we added a new rung, "Conversationalists". Conversationalists reflects two changes. First, it includes not just Twitter members, but also people who update social network status to converse (since this activity in Facebook is actually more prevalent than tweeting). And second, we include only people who update at least weekly, since anything less than this isn't much of a conversation."