The first thing to do is to step in when you see bullying happening. Let the kids know they are not alone. A kind word in passing can go a really long way. Call your local school board and talk to them about taking proactive steps to address bullying and prevent it. That includes training and support for teachers and reaching out to parents to make sure they are helping in this effort. Support initiatives like the Trevor Project and the It Gets Better Project. Support can be as simple as adding your name to a pledge to oppose bullying, to volunteering your time, to making financial contributions. Contact your local officials if you live in an area where cyberbullying laws don't exist or are inadequate. Encourage them to act or at least educate themselves about these issues and the role their rhetoric can play in encouraging or combating this behavior.
These may not seem like they will make the problem go away, but they will start to change the tide.