Shouldn't this be handled by a government agency? It seems awfully risky to have unaccountable companies trade your sensitive information around for profit.
Some of this stuff is handled by the government, such as your driving record (which includes accidents and tickets). You can obtains a copy of yours from your state's DMV.
They aren't totally unaccountable, there is some regulation, notably the Fair Credit Reporting Act, as well as other laws that regulate data brokers.
Americans, in general, are much more comfortable with private for-profit industries handling these sorts of matters over governments.
Anyways, there's absolutely no laws that salaries should be kept secret, your employer can post that information anywhere it wants. In fact, government employees salaries are expressly public information. The reason why employers limit access to salary data is because it keeps salaries lower, it gives them an upper hand in salary negotiations due to information asymmetry. That's why the salaries of professional athletes are public information, they have unions who make sure this information is available.
For me it's a good thing this information is available. I pay lower interest rates, lower insurance premiums, have more access to credit, have no trouble renting before I bought a house.