One thing going on in schools today is that too often the goal really isn't to teach you something but to teach you how to perform and complete a task. That's why sometimes they don't even care what you use, as long as you learn how to use a source. Some teachers don't even bother to look into them, they just look at the bibliography, okay he/she has three links here, okay, check that one off the list. Kids are also allowed, and even encouraged, to do the work online, making copy and pasting common. One of the main reasons I made my site is because there is SO much false and misleading info out there on AA and AN in homemade websites that there is the real potential for people learning the wrong thing so I felt another view needed to be represented.
On the other hand, there are some teachers who won't accept wikipedia because it can be edited by anyone at any time. When I was in school we had to have at least three sources, one encyclopedia, one magazine article and at least one actual book. This supposedly teaches kids how to utilize various different types of media. In those days, we didn't have the internet, of course, but we did have an extensive collection of old magazines and a list of what was in each one. We were supposed to find the right thing in the right one, and fill out a request form for the libararian to get it out of storage.