This is a very good question, and one whose answer would be a good follow-up to my previous research. Some research has been done by a group of scholars on this subject and they have noted that state and local governments in the United States are taking many measures to both control and prevent cyberbullying in this country. These governments have their laws and rules that fall into three main categories: 1. Policies to control the use of electronic media 2. Programs designed to educate and teach children about safe Internet practices and how to avoid and address cyberbullying. These programs also educate the children on the consequences of cyberbullying 3. Technological approaches to prevent the potential for cyberbullying.
Also, the US congress passed the "Protecting Children in the 21st Century Legislation" in 2008 in an effort to address and prevent bullying and harassment online in US schools. Furthermore, since most cyberbullying occurs in and amongst schools, most schools in the US have many preventative measures against online bullying such as internet security and other means to control electronic media.
As far as countries with a high prevalence of cyberbullying, I was unable to find any specifics, however, as I mentioned in my previous research in my podcast, I was able to conclude that cyberbullying is prevalent in the majority of nations with citizens that have access to online media, and especially the social networking sites of today.
References:
Gable, R., Snakenborg, J., & Acker, R. V. (2011). Cyberbullying: Prevention And Intervention To Protect Our Children And Youth. Preventing School Failure: Alternative Education for Children and Youth, 55(2), 88-95.