Looking for ideas for writing a seminar paper on the Ning Network.

I am writing a seminar paper on the Ning network and I am having trouble finding the references I need for the paper.  I was wondering if anyone could suggest any websites or books, etc.. that I might use for this paper. To give you an idea of where I am going with the paper I have included a list of the questions:

1.      Do students selected for participation in the Ning networks approach to teaching view it as a positive learning experience.   

2.      Do student participants find that the Ning network facilitates a deeper understanding of what they are learning?

3.      Do students perceive that their interaction with the teacher in the classroom has changed?

4.      Do students perceive that their interaction with other students in the classroom has changed?

I would really appreciate any ideas/help.