Social Networking

www.Facebook.com
Currently more for personal profiles and finding friends

www.Flickr.com
Online photo management

www.Linkedin.com
Good match for any business

www.MySpace.com
Geared more to younger generation

www.Skype.com
Free calls, video calls, instant messaging over the internet and call conferencing

www.Twitter.com
Can work for some professionals

www.YouTube.com
Online video and place to watch and share original videos