We do cover Internet safety in school, but I agree it could go a lot further. I remember talking to my year 9's about FB. So many kids have people who they are not friends with on their accounts.
I asked if anyone had a friend on their lists who they didn't know in RL. One boy put his hand up. I asked him why and he said that it was ok because he'd sent this person a message when they requested him and asked if he knew him. The random answered yes and so was accepted.
There was a pervert who managed to friend half the girls in the year group and sent them disgusting messages and photos. Once he'd found one person to accept them, he was able to make his way into all her friends accounts as they saw that they had mutual friends, so assumed that they were ok.
Parents really need to be vigilant about checking their children's social media, particularly with friends list. Also looking at what comments they are writing on photos. I've seen examples of vile sexist and sexually explicit language from children as young as 12. Bear in mind that I teach in a naice middle class school with children from highly academic backgrounds.
Also, smartphones should be checked regularly. We caught one 14 year old who had taken a picture of his penis and was showing it to other students. Modern day flashing.
I do agree with the poster that the issue of porn should be covered in sex education.
So schools could take the issue further, but parents need to educate and monitor more too.