The Like Button

The icon is a thumb, extended upward, rendered small enough to sit beneath a photograph of someone's lunch. Tap it and a counter increments by one. The gesture costs less than a second and asks nothing of you afterward: no signature, no reason, no explanation of what, exactly, you approved of. It is the smallest public act available to a person holding a phone. By any estimate the button is operated billions of times a day, which makes approval, as measured in taps, one of the most manufactured products on earth.

The gesture arrives with a pedigree, and the pedigree is false. The upturned thumb is supposed to descend from the Roman arena, where the crowd voted with its hands on whether a fallen gladiator lived or died. Historians have never been able to confirm that the Romans used the thumb this way, and much of the popular picture traces to a French academic painting of 1872, in which a stadium of extras points emphatically at the sand. The gesture that governs the modern internet inherited its authority from a costume drama. Hold on to that. The button borrows the look of an ancient verdict while performing a newer function, and the function is the subject of this file.

The button has a birthday and a payroll. A small aggregator called FriendFeed shipped a "Like" feature in October 2007, and Facebook, which later bought the company, released its own version in February 2009. Inside Facebook the prototype had been called the "awesome button," a name that tested poorly, presumably because awe was more than anyone was prepared to certify. The designers' stated problem was friction. A comment took effort, and effort was throttling the volume of visible response, so the response was compressed into a single motion that required no words, no time, and no thought that could be detected from outside. The compression worked. Within a few years the like was the default unit of social response across every major platform, each with its own thumb, heart, or star, all of them wired to the same counter.

Ask why a company would spend engineering years making approval effortless, and the answer arrives from the behavioral literature the industry read closely and cited rarely. In the 1950s B. F. Skinner established that the schedule of a reward shapes behavior more powerfully than the reward itself, and that the strongest schedule is the variable one, in which the payoff arrives unpredictably. A pigeon paid on a fixed schedule pecks politely. A pigeon paid at random pecks like a gambler. The like is delivered on a variable schedule by construction, because no one can know in advance how a post will perform. You publish, and the counter either moves or it does not, and the only way to find out is to check. The checking is the product. In 2017 Sean Parker, Facebook's founding president, described the design in an interview with a frankness usually reserved for depositions: a "social-validation feedback loop," built to deliver "a little dopamine hit," exploiting, in his words, "a vulnerability in human psychology." The engineer who led the button's construction, Justin Rosenstein, had by then taken to calling his invention's output "bright dings of pseudo-pleasure" and had an assistant configure his phone to keep him away from it. The men who built the lever are on record about what the lever does. The rest of us kept pulling it, on the reasonable grounds that it costs nothing. The count went up by one.

So the button produces checking. Consider next what it collects, because the tap travels in two directions, and only one of them is visible to you. The visible direction delivers a flicker of endorsement to someone you may know. The invisible direction files a record: this account, this item, this timestamp. The record looks too small to matter, and the records do their real work in aggregate. In 2013 three researchers, Michal Kosinski, David Stillwell, and Thore Graepel, published a study of tens of thousands of volunteers showing that Facebook likes alone, with no access to posts, messages, or photographs, predicted sexual orientation, political affiliation, religion, and personality traits with unsettling accuracy. A follow-up study put numbers on the intimacy. With about ten of your likes, a model judged your personality more accurately than a work colleague. With seventy it overtook your friends. With a hundred and fifty it overtook your family. With three hundred it overtook your spouse. Each tap felt like a comment on someone else. Each tap was testimony about you, and the collected testimony described you to strangers with a precision your marriage could not match. The instrument doing this was a thumb the size of a fingernail, and every entry in the file was volunteered.

The law, meanwhile, has been asked what a like is, and its answers are worth reading, because courts are the one venue where the tap is examined under oath. In 2009 a sheriff's deputy in Virginia liked the campaign page of his boss's electoral opponent, and after the election his boss declined to reemploy him. The case went up on the question of whether a like is speech, and in 2013 a federal appeals court ruled that it is: the click, the court wrote, was the internet equivalent of planting a political sign in one's front yard. Four years later a Swiss court convicted a man of defamation for liking posts that called someone an antisemite, on the reasoning that the like spread the statement to his own audience and endorsed it. Absorb the span of that. The same motion of the same thumb is a protected political act in one jurisdiction and a punishable publication in another. The one thing no court has ever ruled it to be is what it feels like at the moment of use, which is nothing. The tap is designed to fall below the threshold of deliberation and to hold up in the record as if deliberation had occurred. An earlier file in this archive examined a checkbox that performs the same trick, and the resemblance is familial. Both are instruments that harvest a legally legible act from a gesture engineered to be thoughtless. The count went up by one.

Now widen the frame, because the counter does something to the people being counted. Once approval has a public number, the number becomes a target, and everything upstream of the number reorganizes to serve it. Writers learn which opinions the counter rewards. Photographers learn which light. Teenagers learn which faces, and delete, before breakfast, the ones that underperform. None of this required an instruction from anyone. The platforms never told a single user what to post, in the way that no casino tells a single gambler what to feel about cherries. The counter instructs by paying, and the instruction is continuous, and it reaches every account at once. The platforms are aware of the effect, and their remedy is instructive. Beginning in 2019, Instagram experimented with hiding like counts, first in Canada, then widely, citing the wellbeing of users who found the numbers distressing. Read the fine print of the mercy. The count was hidden from the audience. It remained visible to the account holder, and it remained fully recorded by the platform, whose ranking systems and advertising auctions consumed it exactly as before. The meter was never turned off. Its face was covered, for comfort, the way one covers a birdcage.

There remains the question this file exists to reach, which is what the button erases. Every artifact in this archive removes a responsibility from somewhere, and the like removes one with unusual elegance. Ask who decides what you see. The feed that assembles your attention each morning is an editorial product, arranging some items forward and burying others, an activity that used to belong to editors, who could be named, blamed, and occasionally fired. The platforms do not employ editors in that sense, and when questioned about what they amplify, they answer with arithmetic: the system surfaces what people engage with. The people, that is, decided. You decided. The billions of taps are produced as the mandate, and the mandate is genuine in the way the checkbox's consent is genuine, which is to say it exists as a record, was engineered to accumulate, and was collected from users acting far below the level of intention the record implies. No one at any platform chose to fill your evening with outrage. The taps chose, and the taps were yours, and the schedule that produced the taps was theirs. The arrangement distributes the authorship of the feed across a billion thumbs until no thumb is responsible, least of all the institution that built the counting.

So return to the thumb under the photograph and settle the ledger it has been keeping. You believed you were giving something small away for free: a nod, a kindness, a fraction of a second of goodwill toward a friend's lunch. Read what the system booked while you did it. It booked a unit of the validation that keeps the poster posting, its supply cost to the platform being zero, since you manufactured it. It booked a line of testimony in the file that predicts you, sharpening the instrument that prices your attention at auction. It booked your enrollment as an unpaid appraiser in the grading system every other user now lives under, and it booked your appraisal as its alibi, the proof that the feed reflects the will of the people rather than the schedule of the house. That was the transaction. The button was never a gift you gave to friends. It was a meter you read into, one tap at a time, and the reading was of you. It cost nothing, as advertised. The count went up by one, and the one, all along, was you.