Ever wonder what percentage of job postings on job boards, like Monster, Zip Recruiter, and Indeed are fake, non-existent jobs? Well, I did, and I got some very good answers on how these job boards work.
One answer comes from Career Coach, Sharon Markowitz
I think its important to understand that the companies you mentioned are oftentimes seen as aggregators of jobs. That means that sometimes by the time the job is advertised on the site, it may not be active anymore. Job sites that actually directly post and pay for the posting are more likely to be current/active jobs.
Additional insights come from Karen Simon
Many are duplicates (multiple agencies recruiting for the same position), some are already filled but will remain posted until background checks are completed and the hired person actually starts working, some postings are for multiple hires needed for the same role, some roles are filled internally, some companies are extremely slow at reviewing incoming resumes.