Privacy, Free Speech, and Blurry Edged Social Networks

Much of Internet-related scholarship over the past ten years has focused on the enormous benefits that come from eliminating intermediaries and allowing user generated one-to-many (one person to many people) communications. Many commentators have noted the tension created between the positive benefits for free speech and the negative effects on user privacy. This tension has been exacerbated by technologies that permit users to create social networks with “blurry edges”—places where they post information generally intended for a small network of friends and family, but which is left available to the whole world to access. The thought is that someone the user cannot identify a priori might find the information interesting or useful. These technological advances have created enormous benefits as people connect to each other and build communities online. The technology that enables these communities, however, also creates an illusion of privacy and control that the law fails to recognize. This Article discusses the technological, social, and legal regimes that have created this framework, and proposes a technical solution to permit users to maintain networks with blurry edges while still appropriately balancing speech and privacy concerns

Three’s Company: An Additional Non-transiting Super-Earth in the Bright HD 3167 System, and Masses for All Three Planets

HD 3167 is a bright (V = 8.9), nearby K0 star observed by the NASA K2 mission (EPIC 220383386), hosting two small, short-period transiting planets. Here we present the results of a multi-site, multi-instrument radial velocity campaign to characterize the HD 3167 system. The masses of the transiting planets are 5.02±0.38 MEarth for HD 3167 b, a hot super-Earth with a likely rocky composition (ρb = 5.60+2.15-1.43g cm-3), and 9.80+1.30-1.24 MEarth for HD 3167 c, a warm sub-Neptune with a likely substantial volatile complement (ρc = 1.97+0.94-0.59 g cm-3). We explore the possibility of atmospheric composition analysis and determine that planet c is amenable to transmission spectroscopy measurements, and planet b is a potential thermal emission target. We detect a third, non-transiting planet, HD 3167 d, with a period of 8.509+/-0.045 d (between planets b and c) and a minimum mass of 6.90±0.71 MEarth. We are able to constrain the mutual inclination of planet d with planets b and c: we rule out mutual inclinations below 1.3 degrees as we do not observe transits of planet d. From 1.3-40 degrees, there are viewing geometries invoking special nodal configurations which result in planet d not transiting some fraction of the time. From 40-60 degrees, Kozai-Lidov oscillations increase the system's instability, but it can remain stable for up to 100Myr. Above 60 degrees, the system is unstable. HD 3167 promises to be a fruitful system for further study and a preview of the many exciting systems expected from the upcoming NASATESS mission.Publisher PDFPeer reviewe