Feedir - Feedir makes it easy to find job listings on Twitter.
LinkedIn Students - Discover career paths and land a job
Nicetweeps - Discover the nicest tweeps based on your interest
LinkedIn - LinkedIn is a business-oriented social networking service, mainly used for professional networking.
FriendZone - Make new friends based on your interests and hobbies
Glassdoor - Glassdoor is a jobs and career marketplace.