My Take
The main drawback is the volume of available content and the way it's organized. The search experience can be daunting. Many teachers have created and shared their own versions of the same videos, and it can be tough to wade through them all to find what you need.
How I Use It
Students might not be actually be watching and comprehending the video. Must have internet access – could cause problems for some students. Does not give the option for group video access – just individual.
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