 Now it's up to more than 60,000. But the wave was not limited to England. Movements to take smartphones away from kids sprang up in the United States, Spain, Australia, Brazil, Canada, South Africa, and even the United Arab Emirates. And when Jonathan Haidt's book was finally published in March, the month after a host of anti-kids' smartphone movements had sprung up, his anxious generation zipped instantly to number one on the bestseller list.