I think kids don't blog as much because it's so much easier for them to get an audience through their current social media networks
I actually like this comment: http://news.ycombinator.com/item?id=2012444 (which you reference towards the end) on why kids use Facebook, which makes a distinction between blogging altruistically and narcisstically. The former means blogging chiefly for others and offering information they couldn't find elsewhere, while the latter means blogging chiefly as a way of raising one's own status.
I'm guessing most kids don't have enough knowledge of ways of structuring what knowledge they do have to make of interest to others -- who they (mostly) don't care about anyway.
I actually like this comment: http://news.ycombinator.com/item?id=2012444 (which you reference towards the end) on why kids use Facebook, which makes a distinction between blogging altruistically and narcisstically. The former means blogging chiefly for others and offering information they couldn't find elsewhere, while the latter means blogging chiefly as a way of raising one's own status.
I'm guessing most kids don't have enough knowledge of ways of structuring what knowledge they do have to make of interest to others -- who they (mostly) don't care about anyway.