4chan and /b/: An Analysis of Anonymity and Ephemerality in a Large Online Community

We present two studies of online ephemerality and anonymity based on the popular discussion board /b/ at 4chan.org: a website with over 7 million users that plays an influential role in Internet culture. Although re-searchers and practitioners often assume that user iden-tity and data permanence are central tools in the design of online communities, we explore how /b / succeeds de-spite being almost entirely anonymous and extremely ephemeral. We begin by describing /b / and performing a content analysis that suggests the community is dom-inated by playful exchanges of images and links. Our first study uses a large dataset of more than five million posts to quantify ephemerality in /b/. We find that most threads spend just five seconds on the first page and less than five minutes on the site before expiring. Our sec-ond study is an analysis of identity signals on 4chan, finding that over 90 % of posts are made by fully anony-mous users, with other identity signals adopted and dis-carded at will. We describe alternative mechanisms that /b / participants use to establish status and frame their interactions