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research elsewhere has found that people are less satisfied when choosing from a larger group: in one study, for example, subjects who selected a chocolate from an array of six options believed it tasted better than those who selected the same chocolate from an array of 30.

evidence shows that the perception that one has appealing alternatives to a current romantic partner is a strong predictor of low commitment to that partner.

people who are in marriages that are either bad or average might be at increased risk of divorce, because of increased access to new partners. Third, it’s unknown whether that’s good or bad for society. On one hand, it’s good if fewer people feel like they’re stuck in relationships. On the other, evidence is pretty solid that having a stable romantic partner means all kinds of health and wellness benefits.” And that’s even before one takes into account the ancillary effects of such a decrease in commitment—on children, for example, or even society more broadly.

he phenomenon extends beyond dating sites to the Internet more generally. “I’ve seen a dramatic increase in cases where something on the computer triggered the breakup,” he says. “People are more likely to leave relationships, because they’re emboldened by the knowledge that it’s no longer as hard as it was to meet new people. But whether it’s dating sites, social media, e‑mail—it’s all related to the fact that the Internet has made it possible for people to communicate and connect, anywhere in the world, in ways that have never before been seen.”

eople seeking commitment—particularly women—have developed strategies to detect deception and guard against it. A woman might withhold sex so she can assess a man’s intentions. Theoretically, her withholding sends a message: I’m not just going to sleep with any guy that comes along. Theoretically, his willingness to wait sends a message back: I’m interested in more than sex.

But the pace of technology is upending these rules and assumptions. Relationships that begin online, Jacob finds, move quickly. He chalks this up to a few things. First, familiarity is established during the messaging process, which also often involves a phone call. By the time two people meet face-to-face, they already have a level of intimacy. Second, if the woman is on a dating site, there’s a good chance she’s eager to connect. But for Jacob, the most crucial difference between online dating and meeting people in the “real” world is the sense of urgency. Occasionally, he has an acquaintance in common with a woman he meets online, but by and large she comes from a different social pool. “It’s not like we’re just going to run into each other again,” he says. “So you can’t afford to be too casual. It’s either ‘Let’s explore this’ or ‘See you later.’ ”

As online dating becomes increasingly pervasive, the old costs of a short-term mating strategy will give way to new ones. Jacob, for instance, notices he’s seeing his friends less often. Their wives get tired of befriending his latest girlfriend only to see her go when he moves on to someone else. Also, Jacob has noticed that, over time, he feels less excitement before each new date. “Is that about getting older,” he muses, “or about dating online?” How much of the enchantment associated with romantic love has to do with scarcity (this person is exclusively for me), and how will that enchantment hold up in a marketplace of abundance (this person could be exclusively for me, but so could the other two people I’m meeting this week)?

“Historically,” says Greg Blatt, the CEO of Match.com’s parent company, “relationships have been billed as ‘hard’ because, historically, commitment has been the goal. You could say online dating is simply changing people’s ideas about whether commitment itself is a life value.” Mate scarcity also plays an important role in people’s relationship decisions. “Look, if I lived in Iowa, I’d be married with four children by now,” says Blatt, a 40‑something bachelor in Manhattan. “That’s just how it is.”

“I think divorce rates will increase as life in general becomes more real-time,” says Niccolò Formai, the head of social-media marketing at Badoo, a meeting-and-dating app with about 25 million active users worldwide. “Think about the evolution of other kinds of content on the Web—stock quotes, news. The goal has always been to make it faster. The same thing will happen with meeting. It’s exhilarating to connect with new people, not to mention beneficial for reasons having nothing to do with romance. You network for a job. You find a flatmate. Over time you’ll expect that constant flow. People always said that the need for stability would keep commitment alive. But that thinking was based on a world in which you didn’t meet that many people.”

“You could say online dating allows people to get into relationships, learn things, and ultimately make a better selection,” says Gonzaga. “But you could also easily see a world in which online dating leads to people leaving relationships the moment they’re not working—an overall weakening of commitment.”

Explaining the mentality of a typical dating-site executive, Justin Parfitt, a dating entrepreneur based in San Francisco, puts the matter bluntly: “They’re thinking, Let’s keep this fucker coming back to the site as often as we can.” For instance, long after their accounts become inactive on Match.com and some other sites, lapsed users receive notifications informing them that wonderful people are browsing their profiles and are eager to chat. “Most of our users are return customers,” says Match.com’s Blatt.

The market is hugely more efficient … People expect to—and this will be increasingly the case over time—access people anywhere, anytime, based on complex search requests … Such a feeling of access affects our pursuit of love … the whole world (versus, say, the city we live in) will, increasingly, feel like the market for our partner(s). Our pickiness will probably increase.” “Above all, Internet dating has helped people of all ages realize that there’s no need to settle for a mediocre relationship.”

Increasingly, we seem to live parallel lives – as a person with a body and as an online avatar. Comedy and tragedy will doubtless ensue. That’s what masks can do.

Unlike previous video lectures, which offered a “static” learning model, the Coursera system breaks lectures into segments as short as 10 minutes and offers quick online quizzes as part of each segment.

Where essays are required, especially in the humanities and social sciences, the system relies on the students themselves to grade their fellow students’ work, in effect turning them into teaching assistants.

The Coursera system also offers an online feature that allows students to get support from a global student community. Dr. Ng said an early test of the system found that questions were typically answered within 22 minutes.

Dr. Koller said the educational approach was similar to that of the “flipped classroom,” pioneered by the Khan Academy, a creation of the educator Salman Khan. Students watch lectures at home and then work on problem-solving or “homework” in the classroom, either one-on-one with the teacher or in small groups.

Not surprisingly, the perception of financial security is a big deal for online Juliets. In one study, Ariely and his colleagues calculated that a man who's 5'9" must outearn a 5'10" suitor by at least $35,000 a year just to be seen as equally attractive.

Using the traditional privacy idea that once something's public, it is public for any purpose, you're lead down a very narrow path of reasoning about this app's appropriateness and what the services it was built on could do about it.

using Nissenbaum's theory, the bad feelings that people have around the app make sense: People gave data to Foursquare or Facebook in one context and then it showed up in another context that they weren't expecting.

Coursekit is free to both the instructors and students that want to have access to it. The company says its main focus is attracting users, not making money

on a basic, even primitive level, girls need to experience the full pantheon of communication that comes from face-to-face contact, such as learning to read body language, and subtle facial and verbal cues.

The fact that the study was based on an online survey gave pause to some academics. While they said the paper raised good questions, they also expressed concern about giving it too much weight, given that the researchers were not able to follow up with the survey subjects to get important context, including their family circumstances, income or ethnicity.

The researchers found that the average amount of media use by the girls surveyed was 6.9 hours per day, a figure that included reading as well as screen time. The average amount of time spent in face-to-face social settings was 2.1 hours, a figure that did not include classroom time.

Ms. Gray said, she worries that her daughter, who is using Facebook more, is playing out her social life online sometimes without the benefits of the full emotional range that comes from face-to-face interaction.

The Vaccine article contains a number of important insights. First, the anti-vaccination cohort likes to move the goal posts: As scientists debunked the link between autism and mercury (once present in some childhood inoculations but now found mainly in certain flu vaccines), most activists dropped their mercury theory and point instead to aluminum or said that kids received “too many too soon.”

Second, it isn't clear whether scientists can "discredit" the movement's false claims at all: Its members are skeptical of what scientists have to say—not least because they suspect hidden connections between academia and pharmaceutical companies that manufacture the vaccines.

mere exposure to the current state of the scientific consensus will not sway hard-core opponents of vaccination. They are too vested in upholding their contrarian theories; some have consulting and speaking gigs to lose while others simply enjoy a sense of belonging to a community, no matter how kooky

attempts to influence communities that embrace pseudoscience or conspiracy theories by having independent experts or, worse, government workers join them—the much-debated antidote of “cognitive infiltration” proposed by Cass Sunstein (who now heads the Office of Information and Regulatory Affairs in the White House)—w

perhaps, it's time to accept that many of these communities aren't going to lose core members regardless of how much science or evidence is poured on them. Instead, resources should go into thwarting their growth by targeting their potential—rather than existent—members.

Given that censorship of search engines is not an appealing or even particularly viable option, what can be done to ensure that users are made aware that all the pseudoscientific advice they are likely to encounter may not be backed by science?

One is to train our browsers to flag information that may be suspicious or disputed. Thus, every time a claim like "vaccination leads to autism" appears in our browser, that sentence woul

The second—and not necessarily mutually exclusive—option is to nudge search engines to take more responsibility for their index and exercise a heavier curatorial control in presenting search results for issues like "global warming" or "vaccination." Google already has a list of search queries that send most traffic to sites that trade in pseudoscience and conspiracy theories; why not treat them differently than normal queries? Thus, whenever users are presented with search results that are likely to send them to sites run by pseudoscientists or conspiracy theorists, Google may simply display a huge red banner asking users to exercise caution and check a previously generated list of authoritative resources before making up their minds.

In more than a dozen countries Google already does something similar for users who are searching for terms like "ways to die" or "suicidal thoughts" by placing a prominent red note urging them to call the National Suicide Prevention Hotline.

in a broader sense, as the case of genetic testing has shown, the right not to know some things (like the right to forget foolish, youthful behavior that is now permanently archived on the Internet) is as crucially important (if not more so) in our age as the voracious pursuit of information and transparency. 

Merely because something is possible, is it also desirable? And if it is possible, must we immediately accommodate ourselves to it? In The Forlorn Demon, Allen Tate noted, “We no longer ask, ‘Is it right?’ We ask: ‘Does it work?’” In our contemporary engagement with technology, we would do well to spend more time with the first question, even as we live ever more mediated lives relentlessly pursuing an answer to the second. 

It’s not only a waste of time, but it’s also a disorder in and of itself — one that preys on the fear and vulnerability of its users to sell them half-truths and, eventually, pills.

the Mayo Clinic is a nonprofit medical-practice-and-research group that started as a clinic. Mayo’s storied past as the country’s premier research hospital, in Rochester, Minn., and its storied present as one of Fortune’s “100 Best Companies to Work For” surface in the integrity of the site itself, which — though not ad-free — is spare and neatly organized, with the measured, learned voice of the best doctors

The integrity of the whole institution is on the line with this site, and the Mayo Clinic has every motivation to keep its information authoritative and up to date.