Social network - visualisation of data - concept

I've already done quite successful social network - it's a virtual gallery of fine arts and design - www.VisibleArt.net. There are 600 users and 8000 artworks in my gallery. People can discuss, add ratings, favorite artworks, etc.

I will visualise various data in modules for users and/or administrators:

• relationships between artworks ("people who like this artwork also like these:" -> similar favorite artworks list)
• relationships between users (for admin to identify fans, friends, enemies and groups)
  
• activity of users on the timeline