"Age is the key factor that differentiates among children’s online experiences, with gender also significant. One in ten children to one in five young teens say they encountered something worrying or nasty online in the past year. Children’s top worries are pornography and violence; they say they encounter these most often on video-sharing sites, followed by other websites, then social networking sites and games. Children are also concerned about the levels of advertising online, their spending too much time online, inappropriate contacts, rumours and nastiness. Top parent concerns include online violence. There has been little increase or decrease in online risk in recent years, although there are some indications of a rise in hate and self-harm content. It is not possible to determine whether the internet has increased the overall amount of risk children face as they grow up, or whether the internet instead provides a new location for risk experiences, but the nature of the internet itself surely alters and amplifies the consequences." (Executive summary, page 2-3)