‘Word of Mouth’ job recommendations are essentially personal recommendations between people who know each other or aware of each other and their businesses. If you have many people helping you in your job hunt, expressing you skills and capabilities to potential employers, then you can be in a very good position to gain a job.
This is why references become extremely important in a job search, and employers want to find out about you, understand you and the way you work, and it gives them a more personal insight into your capabilities, rather than just looking on a CV.
If you have connections with many working professionals, then get the message out there that you’re looking for work, and in return you may be given interviews and meetings through ‘word of mouth’ recommendations that you never though you would acquire.