One of the best features about NowComment is that it is teacher friendly. In this particular example
(
https://nowcomment.com/documents/58343/twopane#.WEKUmKIwjMg)
I added a few elements (a YouTube video and an introductory online photography course) to begin to round out a proto-lesson plan on vanishing point and artistic choices in photography.
NowComment has the capacity to be a "course in a box".