Most websites have a feature that allows you to report inappropriate photographs, videos and content, use these tools to report any abuse so that the offensive content will be removed.
Talk to a trusted adult about whats happening, they may be able to help you, if they cant they will be able to help you get in touch with someone who can.
Don’t be afraid to block people on social sites, this way you have control of who is speaking to you and the content you see.
Make sure all of your personal information is kept private online and make sure you never display your mobile phone number or your home address on social media sites.
Protect your tweets, within the Twitter settings you can make sure people can only follow you if you approve them first.
Make sure your Facebook settings are set to private so only your friends can see your posts.
Turn off your location settings so people do not know your whereabouts.