I would REALLY love if job postings had to go through a government clearing house. Only real jobs get posted. Only real applicants can apply.
Bonus: jobs would have to be classified according to a single government standard, so it should be possible to search for a good job match by at least limiting the field and (allowed) location(s).
making the jobs application (and hiring) market a single market will make it more efficient, and cut out a lot of middlemen inefficiencies. I like it.
You as a hiring company can pay to have a 2nd website, but posting it to the gov't portal is a requirement. The information, such as conditions, salary (range), experience, location etc, are all in standardized format. If you're found to be lying, it's a federal crime (because of fraud and interstate commerce for example).
Applicants also must have gov't issued ID (such as social security), so you cannot be fake.
Bonus: jobs would have to be classified according to a single government standard, so it should be possible to search for a good job match by at least limiting the field and (allowed) location(s).