It's possible that you'll find the perfect job on LinkedIn, CareerBuilder, etc., but if you restrict your hunt to job search sites, you could miss out. As much as 80 percent of all open jobs are never listed. Focus on job boards, and you'll never tap this hidden job market.
Broaden your search. If you never took advantage of your college career center, or talked to a guidance counselor, now's the time to change that. Your career center can help you connect with alumni, buff up your resume, even practice interviewing.
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Get networking. Go to free professional mixers for opportunities to meet potential new contacts. Try college alumni gatherings for networking with people you already have something in common with (your love of your alma mater). Break out that yearbook and make sure you have contact information for classmates who are moving on to careers (plenty of people ditch their university email system address for a private one after graduation, so strike while the iron is hot).