Social Networking for Jewelry Designers?

So, I'm already convinced that weblogging is a great way to promote yourself as a jewelry designer. I talk about that in Promoting Your Jewelry Business via Blogs. I also keep a fairly good size list of jewelry webloggers here. But now there is something else on the Internet that I'm checking into that may have some additional benefits to jewelry designers - social networking.

A social network is made up of a group of people who connect to one another and normally have some kind of common interest. You may even be a member of a social network now such as LinkedIn, Myspace, Ning, or Facebook. There are tons of other social networks on the web, and there are many different reasons to join them. But, what about using one to promote your jewelry business? I'm researching this right now, and I'm interested to hear from anyone who has done this already, so feel free to leave a comment about it.

For those who want more information about social networking, here are a few articles I found around the web:

Crossing the Social Network Chasm
Leveraging Social Networking Sites to Generate Business
4 Social Networking Tips for Bloggers (a video)
How to Use Social Networking for Business
Social Networking in Plain English (a video)