The real question is, what does this say about the impact of online social media in modern society - this is a technology forum, not a social justice opinion shop. Reports say they're using BlackBerries - are they true ? Should social media be regulated ? If the folks running the zoo want to keep running it they always need to be better equipped than, and a step ahead of, the animals, and always used to be. Looks to me like the zookeepers here need to be able to detect, plan, aggregate and deploy before the animals get serious. To do that they need to have a computer system than monitors suspicious communications and predicts trouble before it starts. This may well be an infringement of current liberties and the British find that sort of thing distasteful. You can't very well enact laws that say vendors of communications devices must sell them with a proviso that they can't be used to plan illegal activities, any more than you could ban people using the telephone for illegal activities. But this to me looks similar to the ban on using the internet to host illegal porn - you can only start prceedings once there is evidence that illegal content has been posted online, you can't filter every ftp upload. Likewise Twitter etc... but you can do anonymous statistical analysis of message volume by area, and at a certain point enough would be available to warrant a human to listen in...but it would be open to charges of abuse, and the thresholds levels for human intervention are arbitrary and debateable. My guess is just that police need to be able to aggregate and deploy quicker, using social media themselves, to prevent these angry kids doing things they may well regret next day in court.