A survey by the Bullying Intervention Group showed more than 1 in 6 school children had experienced bullying online. In a separate survey by the Safer Internet Centre, nearly half of all children asked said they had seen something hurtful or unpleasant online.
A school in County Durham is teaching pupils how to stay safe - but do you know what your children are looking at on the internet?
Here are some tips for parents and - below - for your children.
Facebook Checklist - The Safer Internet Centre has released this list, which you can view here: do you and your teenager know who can view their profile, and how to change their privacy settings?
Start a Conversation - keep an open dialogue with your child about what sites they visit on the internet. You can view more suggested "conversation starters" here.
Change your Settings - The Child Exploitation and Online Protection Centre has a list, which you can view here, of tools to help you filter and monitor what your child can view online. You can also set time limits for how long your child can spend on the internet.
Stay Ahead of Technology: Vodafone has released a magazine full of tips, which you can view here. It shows parents how to monitor mobile phone use, set parental controls on online games and change settings on your children's gadgets.
** For children: **
**Childnet has released 5 rules - the SMART list - to keep children safe online.
S Safe: Keep safe by not giving out your email address, phone number or password when you chat online.
M Meeting: Meeting someone you have only been in touch with online can be dangerous. Only do so with a parent or carer present.
*A Accepting: *Accepting e-mails, instant messages, pictures or texts from people you don’t know or trust can lead to problems – they may contain viruses or nasty messages!
*R Reliable: *Someone online might lie about who they are and information on the internet may not be true. It is best only to chat to your real world friends and family.
T Tell: Tell your parent, carer or a trusted adult if someone or something makes you feel uncomfortable.