Social Networking Etiquette with Agents

Given all the new social networking sites, just how should writers contact, or not contact, literary agents on Facebook and Twitter?

The Guide to Literary AGents Editor's Blog has posted a very helpful response here. Click for the full scoop, but here are the basic guidelines:

FACEBOOK
1. Even if you met an agent at a writer's conference, they probably still won't accept you as a friend on Facebook. But you can try. Just don't repeat the effort if you're rebuffed. They keep this site for family and personal friends and, perhaps, their already signed authors.

2. Don't query an agent through Facebook (or any other social networking site)

3. If an agent does befriend you on Facebook, then use that opportunity to learn more about him/her to better prepare your query and pitch... but don't query and pitch on Facebook.


TWITTER
1. This is a network for writers to FOLLOW agents, not interact with them. Use it to learn more about the agents you're following.

2. Why is this important? As a writer, it's in your best interest to be plugged into many social groups. It allows you to have a lot of friends, a lot of contacts, a lot of potential book buyers.