Online Safety

Someone I know has sent me a rude / offensive message on social media, what can I do about it?
Someone has sent me an email which I suspect to be a scam, what do I do about it?
Someone has sent me pictures via email or social media that are indecent, what should I do?
Someone has asked me to send them pictures of me undressed or to do something online I am not happy with, what should I do?
I have been surfing the internet have come across indecent pictures on a website, what do I do?
I have been surfing the internet have come across a website that is offensive about my religion or race, what do I do?
I have been surfing the internet have come across information about terrorism on a website, what do I do?
Someone is sending me annoying, abusive or threatening emails / text messages / letters / phone calls, what can I do?
Someone has put a video or photo of me on the internet that shows me in a compromising position, what can I do?
How do I change my security settings on Facebook?
How do I change my security settings on Twitter?