My project manager is helping me re-design my web-site and marketing strategy. She is of the opinion that LinkedIn is very important. She is training me to blog, and post often to Twitter and LinkedIn. Without much effort I grew my contacts on LinkedIn from 100 to 500 in just one week. It is a big audience that you can speak to.
Work in progress:
http://www.linkedin.com/profile/view...ab_profile_pic