I am having a debate at my school and our Topic is: Social Networking Sites Cause More Harm Than Good.
I am in the Affirmative side and I need to help on what points to use. Please give me website links and I also need a team line. So far I think on debating about the effects, but I will choose the sub-topic with the most information! ;D

It would also be good if you could give me to ideas for the negative team so that I can rebuttal them more easily.