There is masses more information on how you can protect yourself ONLINE and make sure what's happening there doesn't bring your OFFLINE world crashing down. 

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For when you need more assistance than STOP BLOCK SPEAK, you can check out these great sites, but remember, the BEST thing you can do is talk to an adult you trust, at home, at school, at a club/group/organisation you belong to. The moment you tell an adult, you start to break the power that the person or people targeting you have. Go for it.