Yes, and a lot of the job ads are from businesses, especially the temp agencies, which are just collecting applications and don't really have a job to offer. 

Before I retired, mostly from office work, I found job hunting, which I had to do every time I got laid off, very frustrating. You can answer lots of ads and send in lots of resumes, and nobody calls you for a job interview. 

The official unemployment rate doesn't include people who have given up, because no one will hire them. A while back I read that employers were automatically rejecting applications from anyone who had been out of work for six months or more, on the theory that if no one else wanted them neither did they. 

Like landlords, employers can afford to be very picky. Often the requirements to apply for a job are way higher than the job actually needs, which allows them to reject a lot of applications and make their hiring process easier. It's not a very rational process.