I found this article about social media and bullying. The first part talks about anonymous apps and whether they promote online bullying. The second part gets into the reasons behind bullying and how technology impacts bullying. It's an interesting read.

http://bits.blogs.nytimes.com/2014/03/24/experts-offer-their-guidance-to-cope-with-online-bullying/?_php=true&_type=blogs&_r=