Ashleigh Hall's friends from school produced a list, known as Ashleigh's Rules, which was given to all schoolchildren in the area earlier this year.
Aymie Nicole Parker (17), one of the students behind the scheme, said: "We all wanted to get involved in doing something for Ashleigh. We want it to make a difference."
Darlington College principal Tim Grant is looking to roll out Ashleigh's Rules across the country.
"Internet safety is now such a hugely important issue that we have ambitions to make Ashleigh's Rules available to head teachers and principals throughout the land," he said.
He added: "Young people who go online can easily fall prey to the devious tricks of predatory paedophiles who, sadly, are all too willing to prey on the naive and vulnerable." Ashleigh's rules