From this, I can only assume that children are not aware that when you join Facebook, all information is made public, unless you go through settings, and even myself in my 20's have difficulty doing this, I had to get help to take photos put on Facebook by my friends off public viewing so what chance has a 9 year old, especially when according to this report half of parents do not put restrictions on their children using social networking sites (SNS), with Facebook being by far the only one, or most used SNS.
Even more worrying is whether this age group is even aware of the negative issues of using SNS, when do parent and/or teachers actually start educating the risks of these SNS sites, as noted in the research:
Given the possible risks, as well as the many
opportunities afforded by social networking, and since
much SNS usage occurs away from adult supervision,
children’s own digital skills are crucial. This includes
children’s ability to use the safety features embedded
in the sites, although their skills in this respect are
partly dependent on the usability of the featuresthemselves.
http://www2.lse.ac.uk/media@lse/research/EUKidsOnline/ShortSNS.pdf thoughts and statistics produce by EUkids online research