Heres a good starfish created by Darren Barefoot ( and generously provided under a creative commons license). I am already using most of them. You can have a look at a few of my networks and groups in the widgets table on the right which is provided via MyBlogLog.com ( a yahoo service).
My only point to make here is that its all too disjointed. Everything,,,,the content, the networks, the relationships online, are all without structure.
We need to get busy using all these services better and in a specific, goal oriented method instead of just going gaga over the facilities and possibilities of social media networking.
Lets USE them.
Read about specific facilities/applications here.