It's supposed to show how tightly-woven certain groups of your friends are. When I looked at it I noticed certain groups just popping right out, so I made an image sort of blotting the borders:
It's interesting. I really wonder what mine would have looked like last year, or a year from now. The key group around me is the spacefem.com forum members, which makes me feel all warm and fuzzy inside. It looks like my real-life friends are on a tier under that... sort of grouped in the lower left (pink).
I joined livejournal several years ago kinda through the she-net clique and the #beos IRC channel, and those aren't my "key" groups anymore if you believe what this map says. I guess I do. both groups have changed a lot. it makes me wonder what my forum group will look like in three years. There are members who are still really active, who've already been around over a year. I wonder if we'll how long it'll all keep up.
it could be really cool.