Great post by Moz Hussain from the MSN Spaces team that creates a segmentation model for people who use social networking tools (blogs, IM, etc.). He breaks down the community into 4 broad segments:

1. The Content Consumer
2. The Relationship Builder
3. The Social Networker
4. The Content Creator

Just subscribed to Moz…

[thanks to Dare Obesanjo for the link. The full image can be seen here]
[UPDATED: fixed the picture link]