Archive for the ‘Networks in the News’ Category

The Social Bow Tie

07
Nov

A recent study investigated a new way to identify the strength of ties. Using two different large datasets, the researchers found that for each pair of individuals, a bow tie structure of the network itself is strongly associated with the strength of ties between them that the researchers measure in other ways. The abstract of the paper is as follows: Understanding tie strength in social networks, and the factors that influence it, have received much attention in a myriad of disciplines for decades. Several models incorporating indicators of tie strength have been proposed and used to quantify relationships in social networks, and a standard set of structural network metrics have been applied to predominantly online social media sites to predict tie strength. Here, we introduce the concept of the “social bow tie” framework, a small subgraph of the network that consists of a collection of nodes and ties that surround a tie of interest, forming a topological structure that resembles a bow tie. We also define several intuitive and interpretable metrics that quantify properties of the bow tie. We use random forests and regression models to predict categorical and continuous measures of tie strength from different properties of the bow tie, including ...

The Strength of Absent Ties: Social Integration via Online Dating

31
Oct

by Josué Ortega and Philipp Hergovich We used to marry people to which we were somehow connected to: friends of friends, schoolmates, neighbors. Since we were more connected to people similar to us, we were likely to marry someone from our own race. However, online dating has changed this pattern: people who meet online tend to be complete strangers. Given that one-third of modern marriages start online, the authors investigate theoretically, using random graphs and matching theory, the effects of those previously absent ties in the diversity of modern societies. The authors find that when a society benefits from previously absent ties, social integration occurs rapidly, even if the number of partners met online is small. Their findings are consistent with the sharp increase in interracial marriages in the U.S. in the last two decades. Read the full article here.

Decentralized Social Networks Sound Great: Too Bad They’ll Never Work

16
Sep

by Chelsea Barabas, Neha Narula, and Ethan Zuckerman Over the last 13 years, Facebook has evolved from a lifestyle site for college kids into a cornerstone of civic life. It is one of a handful of very large platforms that dominate our online world. As such platforms have gained traction, the web has transformed from an open space for free expression into a corporate-owned gated community of private platforms. The power of giant platforms like Facebook, Google, and Twitter leads to problems ranging from the threat of government-ordered censorship to more subtle, algorithmic biases in the curation of content users consume. Moreover, as these platforms expand their reach, the ripple effects of exclusion can have serious consequences for people’s personal and professional lives, and users have no clear path to recourse. The platforms that host and inform our networked public sphere are unelected, unaccountable, and often impossible to audit or oversee. In response, there is a growing movement among free speech advocates to create new technology to address these concerns. Early web pioneers like Brewster Kahle have called for ways we might “lock the web open” with code, enabling peer-to-peer interactions in place of mediated private platforms. The idea is to return to ...

How does network structure influence the wisdom of crowds?

13
Jul

Researchers at Annenberg School for Communication, University of Pennsylvania recently published a paper about “Network dynamics of social influence in the wisdom of crowds” in PNAS. They conducted an online network experiment where participants were asked to estimate numeric quantity (e.g., the caloric content) and tested how the accuracy of group estimates changes in different communication networks. They found that in decentralized networks, the group estimates were improved and in centralized networks, the accuracy of group estimates was undermined. Read the full article here.

Social networks may one day diagnose disease–but at a cost

05
Jul

by Sam Volchenboum The world is becoming one big clinical trial. Humanity is generating streams of data from different sources every second. And this information, continuously flowing from social media, mobile GPS and wifi locations, search history, drugstore rewards cards, wearable devices, and much more, can provide insights into a person’s health and well-being. It’s now entirely conceivable that Facebook or Google—two of the biggest data platforms and predictive engines of our behavior—could tell someone they might have cancer before they even suspect it. Someone complaining about night sweats and weight loss on social media might not know these can be signs of lymphoma, or that their morning joint stiffness and propensity to sunburn could herald lupus. But it’s entirely feasible that bots trolling social network posts could pick up on these clues. Sharing these insights and predictions could save lives and improve health, but there are good reasons why data platforms aren’t doing this today. The question is, then, do the risks outweigh the benefits? Read the full article here.

Emotion shapes the diffusion of moralized content in social networks

05
Jul

by William J. Brady, Julian A. Willis, John T. Tost, Joshua A. Tucker, and Jay J. Van Bavel Political debate concerning moralized issues is increasingly common in online social networks. However, moral psychology has yet to incorporate the study of social networks to investigate processes by which some moral ideas spread more rapidly or broadly than others. Here, we show that the expression of moral emotion is key for the spread of moral and political ideas in online social networks, a process we call “moral contagion.” Using a large sample of social media communications about three polarizing moral/political issues, we observed that the presence of moral-emotional words in messages increased their diffusion by a factor of 20% for each additional word. Furthermore, we found that moral contagion was bounded by group membership; moral-emotional language increased diffusion more strongly within liberal and conservative networks, and less between them. Our results highlight the importance of emotion in the social transmission of moral ideas and also demonstrate the utility of social network methods for studying morality. These findings offer insights into how people are exposed to moral and political ideas through social networks, thus expanding models of social influence and group polarization as people become increasingly ...

Cuba’s illegal gaming network serves the community

03
Jul

Cuba’s desire for digital connectivity has led to the organization and development of the “Street Network”. It acts as a social community as well as an alternative to government-controlled and regulated Internet service. Gaming online was a key motivator in the network’s development, but it now contains social media, wikis, marketplaces, and more. Being connected is important in 2017, but increasing access globally remains a challenge. The last rule of the Street Network is that you don’t talk about the Street Network. But that wasn’t always the case. For several years the clandestine Havana network of illegal Wi-Fi repeaters, lengths of high-speed network cable and squirreled away servers packed with pirated games, movies and music was sort of an open secret. The government didn’t just turn a blind eye to it; in some cases it protected the valuable equipment located on windowsills and rooftops, keeping an eye out for potential thieves. All of that changed in some people’s eyes in 2015 after several people in the Street Network (often just called the Snet) talked to the Associated Press and brought too much attention to their efforts. Since then, the Snet has continued to grow, quickly stretching outside the bounds of Havana and becoming something ...

Cuba’s illegal gaming network serves the community

03
Jul

Cuba’s desire for digital connectivity has led to the organization and development of the “Street Network”. It acts as a social community as well as an alternative to government-controlled and regulated Internet service. Gaming online was a key motivator in the network’s development, but it now contains social media, wikis, marketplaces, and more. Being connected is important in 2017, but increasing access globally remains a challenge. The last rule of the Street Network is that you don’t talk about the Street Network. But that wasn’t always the case. For several years the clandestine Havana network of illegal Wi-Fi repeaters, lengths of high-speed network cable and squirreled away servers packed with pirated games, movies and music was sort of an open secret. The government didn’t just turn a blind eye to it; in some cases it protected the valuable equipment located on windowsills and rooftops, keeping an eye out for potential thieves. All of that changed in some people’s eyes in 2015 after several people in the Street Network (often just called the Snet) talked to the Associated Press and brought too much attention to their efforts. Since then, the Snet has continued to grow, quickly stretching outside the bounds of Havana and becoming something ...

The ‘time machine’ reconstructing ancient Venice’s social networks

03
Jul

Machine-learning project will analyse 1,000 years of maps and manuscripts from the floating city’s golden age. History hangs heavy at the Frari, and computer scientist Frédéric Kaplan likes it that way. He has an ambition to capture well over 1,000 years of records in dynamic digital form, encompassing the glorious era of the Most Serene Republic of Venice. The project, which he calls the Venice Time Machine, will scan documents including maps, monographs, manuscripts and sheet music. It promises not only to open up reams of hidden history to scholars, but also to enable the researchers to search and cross-reference the information, thanks to advances in machine-learning technologies. Read the full article here.

The ‘time machine’ reconstructing ancient Venice’s social networks

03
Jul

Machine-learning project will analyse 1,000 years of maps and manuscripts from the floating city’s golden age. History hangs heavy at the Frari, and computer scientist Frédéric Kaplan likes it that way. He has an ambition to capture well over 1,000 years of records in dynamic digital form, encompassing the glorious era of the Most Serene Republic of Venice. The project, which he calls the Venice Time Machine, will scan documents including maps, monographs, manuscripts and sheet music. It promises not only to open up reams of hidden history to scholars, but also to enable the researchers to search and cross-reference the information, thanks to advances in machine-learning technologies. Read the full article here.