LinkedIn is terrific for those that are trying to reach business contacts and make professional connections. Another new very dynamic site that allows you to share goals and get help acheiving them is a site called PathConnect.
www.pathconnect.com In less than 3 months they have more than 30,000 users that are helping one another achieve personal and professional goals!
If you want an example please feel free to go directly to my "page" at
http://www.pathconnect.com/footinthedoor
It has already helped me in several of my community endeavors.