- Ben Schneiderman's Circles of Relationships by Joshua Porter + update
- Alex Mather's Circles of Relationships in Social Networks (as seen on left hand side)
- Sarah Cooper's live Recommendation System module (Click on ‘Movies,’ ‘Clothing,’ or ‘Concerts’)
Good outline by Patrick Lambe: Social Networks and Identity Mapping.
Another interesting round-up of issues surrounding marketing and social media: The Future of Communications – A Manifesto for Integrating Social Media into Marketing by Brian Solis."