If you haven't done so already I highly recommend you show this cyber bullying clip to your students. You can watch it on line from digizen.org or order a DVD, free to all schools in NZ.
With the proliferation of netbooks, tablets, ipods and phones in our schools these days and the increasing access to social networks and online learning environments it's really important we keep our students net savvy and safe.
As a syndicate we're working through a 'Conflict' unit at the moment helping students identify, try to understand and resolve conflict situations. It's heart wrenching to see how much students have been affected by regular bullying in the past, so it's really important we teach them how to cope with cyber bullying now, before it's to late.
The movie gets the principal across very well
and REPORT IT
The DVD has follow up interviews and you can find an interactive game on the site too which reinforces the message.
I also recommend the old youtube classics
Cyberbullying - Talent Show
and Think Before You Post
which are also guaranteed to make your students think.