This from career coach, Lindsey Pollak:
Join LinkedIn and use it every day. Many recruiters, headhunters, small business owners and corporate hiring managers are now recruiting through LinkedIn, so make sure you are taking advantage of every aspect of this social networking site. First, set up a complete profile including keywords an employer might use to find someone like you. Join professional networking groups on LinkedIn to build your connections and become part of conversations about industry news. Scour other people's profiles to look for companies you may want to apply to, job titles or professions you didn't know about, professional organizations where you might network and people with similar interests who might be willing to offer you some job search advice.