Besides job boards linked in career bulider and monster. what are some alternative sources of employment opportunities not often thought about how can they be useful in your job search

People could go door to door giving their CVs and asking if there are jobs. Many people think that this isn't a way to get a job but they would be surprised how many times it works. Often companies conduct their interviews on the spot. Another way is putting billboards over the city with a brief resume, people have successfully done this throughout history too.