Visualizing Connections on Social Networks

Are there any social networking sites that allow you to dynamically
visualize your social networks? Are there any that allow you to "tag" your
ties to all the people on your social network graph? The research and
ability is out there - just look at visualcomplexity.com, but my question is
- why can't I navigate through my social networks on LinkedIn, Facebook,
Twitter, Gather, or anywhere else like I can navigate words in
VisualThesaurus.

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