Anil Dash recently posted on his blog that the term cyberbullying used in the media is not useful, not accurate, and distracts people away from the main issue which is bullying. Bullies will misuse whatever tools are available. The emphasis should be on the behaviour not the technology which is used.
With the trend to touch interfaces it is inevitable that biometrics will be used for personalization. There needs to be at least a minimal identity recognition capability for personalization to be useful. It doesn’t have to be perfect though as has already been shown with iPhoto facial recognition.