The definition of bullying behaviour is that it is repeated or has the potential to be repeated. Cyberbullying is covered by this definition, even when there is only a single instance of abuse, because the fact that it occurs online means it may be 'repeated' through sharing. Cyberbullying can take many forms, including posting mean comments or messages, excluding or ignoring someone, tricking or humiliating them through fake accounts, or sharing a photo or video that will make them feel bad.