Libraries before computers...?

I'm not a librarian but a teacher. One of the skills that is so important for kids to know is the benefit of doing research online. However it is essential that kids be smarter about doing research. Before computers, we sort of knew that books were factual and it took lots of work before publishing. Now anyone can publish online. As a student / researcher now, you have to learn the important skill of knowing what is a legitimate site - journal articles, looking at a web address (edu or org). It's like they need to be a bit more of a detetctive to sort thorugh the garbage and find some treasures online.