From the surveillance of dissidents to the hacking of elections to the weaponization of memes, hacking is changing in character, and it is changing the world. Have hacking and hacks crossed a techno-political threshold? How has the relationship of hacking and hackers to their own collectives, to governments, and to the tools and techniques been transformed recently? What does it mean to be a hacker these days, and how does it differ from engineering, from “cyber-security,” from information warfare or from hacktivism?

Vast accumulations saturate our world: phone calls and emails stored by security agencies; every preference of every individual collected by advertisers; ID numbers, and maybe an iris scan, for every Indian; hundreds of thousands of whole genome sequences; seed banks of all existing plants, and of course, books… all of them. Just what is the purpose of these optimistically total archives, and how are they changing us?

This issue of Limn on “Ebola’s Ecologies” examines how the 2014 Ebola outbreak has put the norms, practices, and institutional logics of global health into question, and examines the new assemblages that are being forged in its wake.

Systemic risk has become a central topic of expert discussion and political debate amidst the financial crisis that began in 2008, but it also has resonances across many other domains in which catastrophic threats loom – including internet security, supply chain management, catastrophe insurance, and critical infrastructure protection. In this issue, we invited scholars to contribute genealogical and conceptual framings that inform critical inquiry into this increasingly important concept. The result is not a traditional collection of academic articles but a set of brief, preliminary reflections, prepared on short notice, that address a common set of questions, along with a handful of documents, links, images and videos that illustrate different aspects of the concept.

This issue of Limn focuses on new social media, data mining and surveillance, crowdsourcing, cloud computing, big data, and Internet revolutions. Rather than follow the well-worn paths of argument typical today, our contributors address the problems in new ways and at odd angles: from the power and politics of statistics and algorithms to crowdsourcing’s discontents to the capriciousness of collectives in an election; from the focus group and the casino to the worlds of micro-finance and data-intensive policing. Together they raise questions about the relationship of technology and the collectives that form in and through them.