The tragic death of a 15-year-old Irish girl who had been the victim of bullying will send a chill through parents everywhere.
The incident is being investigated in the US, but it is clear that the teenager went through a very difficult time as a result of being taunted and called names.
People who have experienced bullying can testify to the lifelong effect it can have on their confidence and self-worth.
The effects on teenagers who are at a vulnerable stage in their lives and already feeling insecure about themselves can be even more dangerous.
Technology has made it easier for bullies to prosper.
They can use text messages and online forums to heap further misery on their unfortunate targets.
This means that young people don't even feel safe in their own homes.
Schools and parents must remain vigilant about bullying.