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Certainly, there is a powerful new force developing here. Citizens who previously had little voice in public are using cheap Web tools to tell the world about the drama that has unfolded since President Mahmoud Ahmadinejad was declared the winner of Iran's presidential election. The government succeeded last week in exerting control over Internet use and text-messaging, but Twitter has proven nearly impossible to block. The most common search topic on Twitter for days has been "#iranelection" -- the "hashtag" for discussions about Iran -- and international media outlets are relying on information and images disseminated by ordinary citizens via Twitter feeds. Yet for all its promise, there are sharp limits on what Twitter and other Web tools such as Facebook and blogs can do for citizens in authoritarian societies. The 140 characters allowed in a tweet do not represent the end of politics as we know it -- and at times can even play into the hands of hard-line regimes. No amount of Twittering is going to force Iranian leaders to change course, as Ayatollah Ali Khamenei, the country's supreme leader, made clear during Friday prayers with his stern rebuke of the protesters. In Iran, as elsewhere, true revolution can only happen offline.

We enclose silence - unknown possibility - at our own risk. Jonathan Zittrain demonstrates in his recent work on generativity that the value of systems often comes from unknown uses - the Apple II became succesful when Visicalc, the first spreadsheet, was written for the platform. If you want generative uses for a technology, Zittrain warns that you need to be careful what you lock down. Lewis also cites a case in which cell biologists patented a particular series of amino acids. They had no idea their purpose, but “purifying and describing gives you a right to own.” A later set of researchers speculated that these aminos bloc the growth of cancer cells - on publishing their research, the first researchers sued them for many millions of dollars. This can very effectively prevent exloratory science, he argues. “When we enclose wilderness, we begin to give property rights in areas where we have yet to understand what’s happening.” An enclosure of silence affects the human self and the world we inhabit. How do you become a creative actor in this world? How do you beat the bounds of this commons?

Like many, I have been inspired and excited by the spectacular case studies. Yet when I interview children, or in my survey, I was far more struck by how many use the internet in a far more mundane manner, underusing its potential hugely, and often unexcited by what it could do. It was this that led me to urge that we see children's literacy in the context of technological affordances and legibilities. But it also shows to me the value of combining and contrasting insights from qualitative and quantitative work. The spectacular cases, of course, point out what could be the future for many children. The mundane realities, however, force the question - whose fault is it that many children don't use the internet in ways that we, or they, consider very exciting or demanding? It also forces the question, what can be done, something I attend to throughout the book, as I'm keen that we don't fall back into a disappointment that blames children themselves.

There's been a fair amount of adult dismay at how young people disclose personal, even intimate information online. In the book, I suggest there are several reasons for this. First, adolescence is a time of experimentation with identity and relationships, and not only is the internet admirably well suited to this but the offline environment is increasingly restrictive, with supervising teachers and worried parents constantly looking over their shoulders. Second, some of this disclosure is inadvertent - despite their pleasure in social networking, for instance, I found teenagers to struggle with the intricacies of privacy settings, partly because they are fearful of getting it wrong and partly because they are clumsily designed and ill-explained, with categories (e.g. top friends, everyone) that don't match the subtlety of youthful friendship categories. Third, adults are dismayed because they don't share the same sensibilities as young people. I haven't interviewed anyone who doesn't care who knows what about them, but I've interviewed many who think no-one will be interested and so they worry less about what they post, or who take care over what parents or friends can see but are not interested in the responses of perfect strangers. In other words, young people are operating with some slightly different conceptions of privacy, but certainly they want control over who knows what about them; it's just that they don't wish to hide everything, they can't always figure out how to reveal what to whom, and anyway they wish to experiment and take a few risks.

contrary to the popular discourses that blame young people for their apathy, lack of motivation or interest, I suggest that young people learn early that they are not listened to. Hoping that the internet can enable young people to 'have their say' thus misses the point, for they are not themselves listened to. This is a failure both of effective communication between young people and those who aim to engage them, and a failure of civic or political structures - of the social structures that sustain relations between established power and the polity.

Instead of a contactless payment sticker for your mobile phone, why not just skin the entire phone? That’s the reasoning behind Phoolah the product that that Mobile Payment Skins, a Knoxville, Tenn.-based provider of mobile contactless payment service solutions that is launching this fall. The name comes from a combination of payment card, personalized skin and mobile phone. When a card holder receives his personalized vinyl skin embedded with a contactless payment chip linked to a prepaid debit card, he peels it from its backing and wraps it about his phone.

This week, Sonia Livingstone's latest book, Children and the Internet: Great Expectations and Challenging Realities, is being released by Polity. As with the earlier study, it combines quantitative and qualitative perspectives to give us a compelling picture of how the internet is impacting childhood and family life in the United Kingdom. It will be of immediate relevence for all of us doing work on new media literacies and digital learning and beyond, for all of you who are trying to make sense of the challenges and contradictions of parenting in the digital age. As always, what I admire most about Livingstone is her deft balance: she does find a way to speak to both half-full and half-empty types and help them to more fully appreciate the other's perspective.

My book argues that young people's internet literacy does not yet match the headline image of the intrepid pioneer, but this is not because young people lack imagination or initiative but rather because the institutions that manage their internet access and use are constraining or unsupportive - anxious parents, uncertain teachers, busy politicians, profit-oriented content providers. I've sought to show how young people's enthusiasm, energies and interests are a great starting point for them to maximize the potential the internet could afford them, but they can't do it on their own, for the internet is a resource largely of our - adult - making. And it's full of false promises: it invites learning but is still more skill-and-drill than self-paced or alternative in its approach; it invites civic participation, but political groups still communicate one-way more than two-way, treating the internet more as a broadcast than an interactive medium; and adults celebrate young people's engagement with online information and communication at the same time as seeking to restrict them, worrying about addiction, distraction, and loss of concentration, not to mention the many fears about pornography, race hate and inappropriate sexual contact.

I think it's vital that research seeks a balanced picture, examining both the opportunities and the risks, therefore, and I argue that to do this, it's important to understand children's perspectives, to see the risks in their terms and according to their priorities.