"The answer to content overload is to...create more content."
Hargadon has problem with Kahn Academy and TED. It's nice to have that info available, but the point of technology is to create content. "Finding the best lesson" doesn't make sense, if the web is about conversation and content creation. That info can be used for backup, but it doesn't replace teaching content to students 1:1.
Learning as memorization vs. Learning as creation > which do you want to espouse?
Learning as creation is hard work.