Who to Include in Your Career Network
Your career network should include anyone who can assist you with a job search or career move. It can include past and present co-workers, bosses, friends with similar interests, colleagues from business associations, alumni from your university, or acquaintances you have met via online networking services. Your network can also include family, neighbors, and anyone who might have a connection that will help.

What Your Career Network Can Do For You
Over 80% of job seekers say that their network has helped with their job search. Networking contacts can help with more than job leads. They can provide referrals to or insider information about companies you might be interested in working for. They can provide information on career fields you might want to explore or what the job market is like on the other side of the country. Your network can give you advice on where to look for jobs or review your resume. The possibilities are endless.

http://jobsearch.about.com/od/networking/a/networkingtips.htm