Job Boards are quite useful
I have had over a dozen job placements in the last 10-12yrs from job boards, each of them were job advertisement listings that I applied for, along with more than 30 interviews. The resume builders and job search tips are useful, (albeit not as good as some articles written by employment agencies). That said, I have never had a worthwhile contact as a result of listing my resume on a job board, but keeping your current resume there is handy if you need to make a quick application. I have also got a few jobs by 'word of mouth' and others by direct application, although many employers seem now to go straight to the job ads if they need applicants to fill a position quickly. as I see it, if the employer is looking for long-term, best skilled applicants, they would probably ask around former colleagues for talent. if they are only after a temp/contract position to fill, the online ads are a quick fix.
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