Imo Twitter isn't even aimed at 15 year olds ... schoolkids have **** all to write about anyway, they can't do anything, same goes for using Facebook - which Zuckerburg set up for
Uni students. These network sites are really aimed at 6th formers and even more so at University students.
Myspace is for 15 year olds.
I'm guessing old grannies don't Twitter, because they aren't the intended market either. So Network sites aren't good for Market Development, big deal, they are still doing
very well with their intended market.
And, "15-year old
expert"?! How is he an 'expert'? He's just an average kid. Clearly one that doesn't use Twitter either; ergo, is not an expert on it. He'll find the need for such network sites after he leaves school, starts college, leaves college and moves away to Uni. That constant reshuffling of friends makes such sites necessary for getting to know your new friends and keeping in touch with the old ones, what would he and his friends know about that? They're all much too young, and still in the happy world of seeing every friend you've ever had the next day at school. Without needing to catch up with old friends, or having anything interesting to talk about (eg, "just got back from school, doing English homework

" or "having dinner then going to bed!" ...) what would he need it for anyway?
That's why
they don't use it, they have no
need for it. He may be able to talk for school kids, but he certainly can't speak for all teens, like the older ones, which he claims to be able to.
However, I agree on the point of online advertising. Marketing departments clearly have no idea at all on how useless it is, all of it is money wasted. I'm not sure if others agree with me on this, but I can honestly say that I have never noticed - even less, been
influenced by a single internet ad that I have ever seen. Generally they all piss me off, especially pop-ups, the use of which makes me lose respect for a company. It's almost a sign of desperation for customers to me, and showing complete disregard for the fact that they are getting 'in my way'.