When a local council banned 9 year old Martha Payne from photographing her school meals, scoring them on a 'Food-o-meter' scale for healthiness, and posting to her blog they thought they were averting a PR scandal. Instead, as New Statesman put it, in "swerving to avoid a PR disaster molehill, have just crashed full speed into a PR disaster mountain".  
The resulting publicity about the banned blog did more to raise awareness of the inadequacies of school meals in Argyll and Bute than any single blog could have done. Once again, power to the citizen journalist, even the 9 year olds.