I have written about this topic before – even writing a published paper about the topic in the Journal of Curriculum and Pedagogy. This post on The Blue Skunk Blog raises a good point worth considering;
By blocking social networking tools in our schools, to whom are we really denying access? All kids or only those who cannot afford home Internet access? Are we marginalizing the already marginalized in our society by preventing them from the only opportunity (in school) they may have to participate in a participatory culture by filtering?