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In fact, according to a recent study published in the Proceedings of the National Academy of Sciencesdating apps and websites have surpassed any other method of meeting a potential love interest, and have been responsible for nearly 40 percent of all new relationships as of But how is it that these apps are setting people up with their perfect person? Well, chalk it up to their algorithms: a calculation of a computer which works on whether the users of the app are compatible with one another or not. Some use questions, some use other ways, but it still boils down to human attraction.

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The algorithm method: how internet dating became everyone's route to a perfect love match

It meant a lot of late nights as he ran complex calculations through a powerful supercomputer in the early hours of the morning, when computing time was cheap. While his work hummed away, he whiled away time on online dating sites, but he didn't have a lot of luck — until one night, when he noted a connection between the two activities. One of his favourite sites, OkCupidsorted people into matches using the answers to thousands of questions posed by other users on the site.

McKinlay started by creating fake profiles on OkCupid, and writing programs to answer questions that had also been answered by compatible users — the only way to see their answers, and thus work out how the system matched users. He managed to reduce some 20, other users to just seven groups, and figured he was closest to two of them. So he adjusted his real profile to match, and the messages started rolling in. McKinlay's operation was possible because OkCupid, and so many other sites like it, are much more than just simple social networks, where people post profiles, talk to their friends, and pick up new ones through common interest.

Instead, they seek to actively match up users using a range of techniques that have been developing for decades. Every site now makes its own claims to "intelligent" or "smart" technologies underlying their service. But for McKinlay, these algorithms weren't working well enough for him, so he wrote his own. McKinlay has since written a book Optimal Cupid about his technique, while last year Amy Webb Dating websites algorithms, a technology CEO herself, published Data, a Love Story documenting how she applied her working skills to the tricky business of finding a partner online.

Two people, both unsatisfied by the programmes on offer, wrote their own; but what about the rest of us, less fluent in code? Years of contested research, and moral and philosophical assumptions, have Dating websites algorithms into creating today's internet dating sites and their matching algorithms, but are we being well served by them?

The idea that technology can make difficult, even painful tasks — including looking for love — is a pervasive and seductive one, but are their matchmaking powers overstated? I n the summer ofa Harvard undergraduate named Jeff Tarr decided he was fed up with the university's limited social circle. As a maths student, Tarr had some experience of computers, and although he couldn't program them himself, he was sure they could be used to further his primary interest: meeting girls.

With a friend he wrote up a personality quiz for fellow students about their "ideal date" and distributed it to colleges across Boston. Sample questions included: "Is extensive sexual activity [in] preparation for marriage, part of 'growing up?

Operation Match was born. Each questionnaire was transferred to a punch-card, fed into the machine, and out popped a list of six potential dates, complete with address, phone and date of graduation, which was posted back to the applicant. Each of those Dating websites algorithms s got the original and five others in their response: the program only matched women with their ideal man if they fitted his ideal too. Even at the birth of the computer revolution, the machine seemed to have an aura about it, something which made its matches more credible than a blind date or a friend's recommendation.

Shalit quoted a freshman at Brown University who had dumped her boyfriend but started going out with him again when Operation Match sent her his. Shalit imbued it with even more weight, calling it "The Great God Computer". The computer-dating pioneers were happy to play up to the image of the omniscient machine — and were already wary of any potential stigma attached to their businesses.

We supply everything but the spark. DeWan made the additional claim that Contact's questions were more sophisticated than Match's nationwide efforts, because they were restricted to elite college students. In essence, it was the first niche computer-dating service.

Understanding how tinder, match, and other dating sites really work

Over the years since Tarr first starting sending out his questionnaires, computer dating has evolved. Most importantly, it has become online dating. And with each of these developments — through the internet, home computing, broadband, smartphones, and location services — the turbulent business and the occasionally dubious science of computer-aided matching has evolved too. Online dating continues to hold up a mirror not only to the mores of society, which it both reflects, and shapes, but to our attitudes to technology itself. The American National Academy of Sciences reported in that more than a third of people who married in the US between and met their partner online, and half of those met on dating sites.

The rest met through chatrooms, online games, and elsewhere. Preliminary studies also showed that people who met online were slightly less likely to divorce and claimed to be happier in their marriages. The latest figures from online analytics company Comscore show that the UK is not far behind, with 5. When online dating moves not only beyond stigma, but beyond the so-called "digital divide" to embrace older web users, it might be said to have truly arrived.

It has taken Dating websites algorithms while to get there. It believed it could do this thanks to the research of its founder, Neil Clark Warren, a then old psychologist and divinity lecturer from rural Iowa. His three years of research on 5, married couples laid the basis for a truly algorithmic approach to matching: the of a question survey of new members the "core personality traits"together with their communication patterns Dating websites algorithms were revealed while using the site. Whatever you may think of eHarmony's approach — and many contest whether it is scientifically possible to generalise from married people's experiences to the behaviour of single people — they are very serious about it.

Since launch, they have surveyed another 50, couples worldwide, according to the current vice-president of matching, Steve Carter. When they launched in the UK, they partnered with Oxford University to research 1, British couples "to identify any cultural distinctions between the two markets that should be represented by the compatibility algorithms". And when challenged by lawsuits for refusing to match gay and lesbian people, assumed by many to be a result of Warren's conservative Christian views his books were ly published in partnership with the conservative pressure group, Focus on the Familythey protested that it wasn't morality, but mathematics: they simply didn't have the data to back up the promise of long-term partnership for same-sex couples.

As part of a settlement in one such lawsuit, eHarmony launched Compatible Partners in Carter says: "The Compatible Partners system is now based on models developed using data collected from long-term same-sex couples. These services rely on the user supplying not only explicit information about what they are looking for, but a host of assumed and implicit information as well, based on their morals, values, and actions. What underlies them is a growing reliance not on stated preferences — for example, eHarmony's question surveys result in a detailed profile entitled "The Book of You" — but on actual behaviour; not what people say, but what they do.

Despite competition from teams composed of researchers from telecoms giants and top maths departments, Potter was consistently in the top 10 of the leaderboard. A retired management consultant with a degree in psychology, Potter believed he could predict more about viewers' tastes from past behaviour than from the contents of the movies they liked, and his maths worked. He was contacted by Nick Tsinonis, the founder of a small UK dating site called yesnomayb, who asked him to see if his approach, called collaborative filtering, would work on people as well as films.

Collaborative filtering works by collecting the preferences of many people, and grouping them into sets of similar users. Because there's so much data, and so many people, what exactly the thing is that these groups might have in common isn't always clear to anyone but the Dating websites algorithms, but it works. The approach was so successful that Tsinonis and Potter created a new company, RecSyswhich now supplies some 10 million recommendations a day to thousands of sites.

RecSys adjusts its algorithm for the different requirements of each site — what Potter calls the "business rules" — so for a site such as Lovestruck. Likewise, while British firm Global Personals provides the infrastructure for some 12, niche sites around the world, letting anyone set up and run their own dating website aimed at anyone from redhe to petrolhe, all 30 million of their users are being matched by RecSys.

Potter says that while they started with dating "the technology works for almost anything". RecSys is already powering the recommendations for art discovery site ArtFinder, the similar articles search on research database Nature. Of particular interest to the company is a recommendation system for mental health advice site Big White Wall. Because its users come to the site looking for emotional help, but may well be unsure what exactly it is they are looking for, RecSys might be able to unearth patterns of behaviour new to both patients and doctors, just as it reveals the unspoken and possibly even unconscious proclivities of daters.

Back in Harvard inJeff Tarr dreamed of a future version of his Operation Match programme which would operate in real time and real space. He envisioned installing hundreds of typewriters all over campus, each one linked to a central "mother computer". Anyone typing their requirements into such a device would receive "in Dating websites algorithms the name of Dating websites algorithms compatible match who was also free that night. Recently, Tarr's vision has started to become a reality with a new generation of dating services, driven by the smartphone. Suddenly, we don't need the smart algorithms any more, we just want to know who is nearby.

But even these new services sit atop a mountain of data; less like Facebook, and a lot more like Google. Tinder, founded in Los Angeles inis the fastest-growing dating app on mobile phones but its founders don't like calling it that.

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According to co-founder and chief marketing officer Justin Mateen, Tinder is "not an online dating app, it's a social network and discovery tool". Dating websites algorithms also believes that Tinder's core mechanic, where users swipe through Facebook snapshots of potential matches in the traditional "Hot or Not" format, is not simple, but more sophisticated: "It's the dynamic of the pursuer and the pursued, that's just how humans interact.

When asked what they have learned about people from the data they have gathered, Mateen says the thing he is most looking forward to seeing is "the of matches that a user needs over a period of time before they're addicted to the product" — a precursor of Tinder's expansion into other areas of ecommerce and business relationships. Tinder's plans are the logical extension of the fact that the web has really turned out to be a universal dating medium, whatever it says on the surface. There are plenty of sites out there deploying the tactics and metrics of dating sites without actually using the D-word.

Whether it's explicit — such as Tastebuds. Nearly every Silicon Valley startup video features two photogenic young people being brought together, whatever the product, and the same matching algorithms are at work whether you're looking for love, a jobbing plumber, or a stock photograph. After gathering his data and optimising his profile, he started receiving unsolicited messages every day: an unheard of figure online, where the preponderance of creeps tends to put most women on the defensive.

He went on 87 dates, mostly just a coffee, which "were really wonderful for the most part". The women he met shared his interests, were "really intelligent, creative, funny" and there was almost always some attraction. But on the 88th date, something deeper clicked. A year later, he proposed. Online dating has always been in part about the allure and convenience of the technology, but it has mostly been about just wanting to find "the one".

The success of recommendation systems ,which are just Dating websites algorithms applicable to products as people, says much about the ability of computers to predict the more fundamental attractions that would have got McKinlay there sooner — his algorithms improved his ability to get dates, but not much on the likelihood of them progressing further.

In the end, the development of online dating tells us more about our relationship with networked technology than with each other: from "the Great God Computer", to a profusion of data that threatens to overwhelm us, to the point where it is integrated, seamlessly and almost invisibly, with every aspect of our daily lives. The Observer Online dating. The algorithm method: how internet dating became everyone's route to a perfect love match.

Six million Britons are looking for their perfect partner online before Valentine's day on Friday, but their chance of success may depend on clever maths rather than charisma. Six million Britons visit dating sites each month.

James Bridle.

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