Two-thirds of 5-7 year olds now use the internet at home, rising to over three-quarters of 8-11 year olds and over four-fifths of 12-15s. Of these, one fifth of 5-7 year olds use the internet without an adult present, as do almost half of 8-11 year olds and two-thirds of 12-15s. 12-15 year olds say they...