Just to clarify, it's our research that is studying grades 4 to 11. There are a number of reasons for this. One is so that we can compare data with earlier surveys that covered that age range. But our resources cover the full K to 12 curriculum.
We've made an effort in the last few years to produce more digital literacy resources for younger children, because we know that young people are going online earlier and earlier. It's particularly true with the introduction of touch screen tablets, which are very kid-friendly. It's not at all unusual these days for parents to report that their kids are going online for the first time at the age of two.
We also know from our own research and research done around the world that the landscape online for young people is tremendously commercialized; that the majority of the sites most popular with young people are commercial sites. So it's really important that they develop these digital literacy skills as early as possible.