July 16, 2024

Archives for June 2014

Facebook's Emotional Manipulation Study: When Ethical Worlds Collide

The research community is buzzing about the ethics of Facebook’s now-famous experiment in which it manipulated the emotional content of users’ news feeds to see how that would affect users’ activity on the site. (The paper, by Adam Kramer of Facebook, Jamie Guillory of UCSF, and Jeffrey Hancock of Cornell, appeared in Proceedings of the […]

On Decentralizing Prediction Markets and Order Books

In a new paper to be presented next week at WEIS by Jeremy Clark, we discuss the challenges in designing truly decentralized prediction markets and order books. Prediction markets allow market participants to trade shares in future events (such as “Will the USA advance to the knockout stage of the 2014 World Cup?”) and turn […]

Cognitive disconnect: Understanding Facebook Connect login permissions

[Nicky Robinson is an undergraduate whose Junior Independent Work project, advised by Joseph Bonneau, turned into a neat research paper. — Arvind Narayanan] When you use the Facebook Connect [1] login system, another website may ask for permission to “post to Facebook for you.” But what does this message mean? If you click “Okay”, what […]

Bitcoin Mining Now Dominated by One Pool

The big news in the Bitcoin world, is that one entity, called GHash, seems to be in control of more than half of all of the mining power. A part of Bitcoin’s appeal has been its distributed nature: the idea that no one party is in control but the system operates through the cooperative action […]

Encryption as protest

As a computer scientist who studies Privacy-Enhancing Technologies, I remember my surprise when I first learned that some groups of people view and use them very differently than I’m used to. In computer science, PETs are used for protecting anonymity or confidentiality, often via application of cryptography, and are intended to be bullet-proof against an […]