Most commentary on social media ignores an obvious truth—that the value of things is largely determined by their rarity. The more people tweet, the less attention people will pay to any individual tweet. The more people “friend” even passing acquaintances, the less meaning such connections have. As communication grows ever easier, the important thing is detecting whispers of useful information in a howling hurricane of noise. For speakers, the new world will be expensive. Companies will have to invest in ever more channels to capture the same number of ears. For listeners, it will be baffling. Everyone will need better filters—editors, analysts, middle managers and so on—to help them extract meaning from the blizzard of buzz.