Applause, today, is much the same. In the studio, in the theater, in places where people become publics, we still smack our palms together to show our appreciation -- to create, in cavernous spaces, connection. ("When we applaud a performer," argues the sociobiologist Desmond Morris, "we are, in effect, patting him on the back from a distance.") We applaud dutifully. We applaud politely. We applaud, in the best of circumstances, enthusiastically. We applaud, in the worst, ironically.

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We find ways, in short, to represent ourselves as crowds -- through the very medium of our crowd-iness.

But we're reinventing applause, too, for a world where there are, technically, no hands. We clap for each others' updates on Facebook. We share. We link. We retweet and reblog the good stuff to amplify the noise it makes. We friend and follow and plus-1 and plus-K and recommend and endorse and mention and (sometimes even, still) blogroll, understanding that bigger audiences -- networked audiences -- can be their own kind of thunderous reward. We find new ways to express our enthusiasms, to communicate our desires, to encode our emotions for transmission. Our methods are serendipitous and also driven, always, by the subtle dynamics of the crowd. We clap because we're expected to. We clap because we're compelled to. We clap because something is totally awesome. We clap because we're generous and selfish and compliant and excitable and human.

This is the story of how people clapped when all they had, for the most part, was hands -- of how we liked things before we Liked things. Applause, participatory and observational at the same time, was an early form of mass media, connecting people to each other and to their leaders, instantly and visually and, of course, audibly. It was public sentiment analysis, revealing the affinities and desires of networked people. It was the qualified self giving way to the quantified crowd.

It was big data before data got big.

'This Is How You Gauge the People'

Scholars aren't quite sure about the origins of applause. What they do know is that clapping is very old, and very common, and very tenacious -- "a remarkably stable facet of human culture." Babies do it, seemingly instinctually. The Bible makes many mentions of applause - as acclamation, and as celebration. ("And they proclaimed him king and anointed him, and they clapped their hands and said, 'Long live the king!'")

But clapping was formalized -- in Western culture, at least -- in the theater. "Plaudits" (the word comes from the Latin "to strike," and also "to explode") were the common way of ending a play. At the close of the performance, the chief actor would yell, "Valete et plaudite!" ("Goodbye and applause!") -- thus signaling to the audience, in the subtle manner preferred by centuries of thespians, that it was time to give praise. And thus turning himself into, ostensibly, one of the world's first human applause signs.

As theater and politics merged -- particularly as the Roman Republic gave way to the Roman Empire -- applause became a way for leaders to interact directly (and also, of course, completely indirectly) with their citizens. One of the chief methods politicians used to evaluate their standing with the people was by gauging the greetings they got when they entered the arena. (Cicero's letters seem to take for granted the fact that "the feelings of the Roman people are best shown in the theater.") Leaders became astute human applause-o-meters, reading the volume -- and the speed, and the rhythm, and the length -- of the crowd's claps for clues about their political fortunes.