What measures can be taken to reduce cyberbullying?

I don't know what measures you initially mean. But here are some measures you can take:

Don't use social networking sites like Facebook or Twitter.

If you do use them, only add your friends, if you want to avoid bullying don't add people you know will bully you.

Confront the people who are doing it to you, see if they have the bottle to say it to you face.

Try not to stand out as much, cyber bullying could be a result of how you act in school or when around people.