A few years ago, I had a fairly large (500+) freelance network on Yahoo called Freelance Writers and Editors. One of the network members was C. Hope Clark of Funds for Writers.
I surprised Hope by sending her a one-on-one email asking how I could improve how I was handling the network. Why was she surprised? She thought that I was professional and doing a good job.
That was nice, but I was still looking for ways to improve. She noted that I was just putting "Tom" at the end of messages to the network, and I should put something in a professional signature telling networkers that it was my network. Maybe I should promote myself as well.
So I came up with something like this after messages: