The Ofcom report “Children and Parents: Media Use and Attitudes Report”  (November 2015) writes: “In 2005 14% of internet users aged 8-11 and 19% aged 12-15 said they had come across something of concern to them online in the previous year. In 2015 11% of 8-11s who go online and 16% of 12-15s said they had seen something online that was worrying, nasty or offensive in the past year.”