James Pinchin – Strava

Strava is a service which bills itself as ‘the social network for athletes’. It allows users to store and share details of their activities, usually location records from runs or bike rides. Through sharing users can compare their performance and even (sometimes controversially1,2,3) compete over ‘segments’. Engineers at Strava are not ignorant to the value of their dataset. Staff in their ‘labs’4 are using the data to increase the size of their user base and sustain users engagement with their service.

Recently they released a global heatmap5 which they claim contains data from one billion activities and three trillion recorded locations. Given the size of the dataset, the lack of named users and the provision of (optional) ‘privacy zones’ in the Strava service5 you might expect this to be an interesting piece of internet ephemera, mostly of interest to runners and cyclists planning their next route. However users were quick to find other valuable information in the dataset.

As many global news outlets noted – not only the location, but also the layout of sensitive military sites were unwittingly revealed by the activities of fitness conscious personnel6,7. The suggestion from Strava8, the press and military leadership – military personnel should make use of privacy features, not use activity tracking apps in these places and don’t worry, Strava will work with military and government officials to filter ‘sensitive data’.

Nobody seems to be asking if Strava really needs to collect and store this location information. Can a service survive which provides locally calculated segment times, performance figures and comparative analyses without the need for users to reveal full location information in the first place? Is it possible to extract societal and monetary value from location time series without crossing security and privacy barriers? My answer is yes, and that’s what my research is about.



3 http://www.mamilsports.com/cycling/strava-beef-goes-viral-aussie-cyclists-trade-insults-kom-leaderboard/

4 https://labs.strava.com/

5 https://labs.strava.com/heatmap/#7.00/-120.90000/38.36000/hot/all

6 https://support.strava.com/hc/en-us/articles/115000173384-Privacy-Zones

7 https://edition.cnn.com/2018/01/28/politics/strava-military-bases-location/index.html

8 https://www.theguardian.com/world/2018/jan/28/fitness-tracking-app-gives-away-location-of-secret-us-army-bases#

9 https://blog.strava.com/press/a-letter-to-the-strava-community/



Tracks in the Strava global heatmap created by users exercising on the decks of ships moored at Portsmouth naval base, UK.

©Strava 2017 ©Mapbox ©OpenStreetMap

James Pinchin, Transitional Assistant Professor, Horizon Digital Economy Research

Stuart Reeves

Recently I have been working on a couple of ongoing investigations. One is based around examining what UX practitioners–as distinguished from HCI researchers–do when they are performing user research. The other, with Martin Porcheron and Joel Fischer, is exploring how people use speech-based ‘assistants’ in the home, such as the Amazon Echo.

Since its earliest days, a core concern of HCI research has been invested in developing ways of locating and dealing with the problems users of interactive systems might encounter. The terminology and concepts have changed over time, from notions of usability to more recent ideas about user experience. But much of this work has overlooked a couple of important aspects. Firstly, how problem identification is practically achieved (e.g., via user testing), and secondly that there is significant daylight between academic and practitioners’ applications of various evaluation methods. Recently I’ve combined these interests by examining how industry practitioners perform user testing as one piece of a broader project lifecycle. The reason why I’m doing this work is that HCI has only a limited (but growing) understanding of ‘what practitioners do’ in spite of much lip service being paid to the importance of academic HCI outputs and their potential operationalisation in practice. If we don’t really know what they are doing, then it is arguable whether HCI can reasonably make such claims. Another reason to focus on practitioners’ work practices is because I feel that HCI itself can learn much from various innovations and ways of working that might be taking place in that work.

Recently I have been involved in examining empirical data about the way that people interact with voice user interfaces, conversational assistants and so on. In particular we (Martin Porcheron, Joel Fischer) have spend some time examining the organisation of talk with / around the Amazon Echo, that Martin has deployed to various homes as part of his PhD work. While there is a paper on this work that has been recently accepted to CHI 2018, I can detail a few of the key findings here. The Amazon Echo is positioned as a voice assistant for the home that can answer questions, help with cooking, and play music (amongst other things). Martin’s data shows how users of the Echo must develop particular ways of talking ‘to’ the device and managing the various interactional problems that they encounter (e.g., recognition problems, or knowing what they can actually do with it). Users also seem to approach the device more as a resource to ‘get something done’ than an agent that one can have a ‘conversation’ with. Finally, we believe that there are some potential implications for design in this work, such as ways that one might move towards considering ‘request and response design’ instead of potentially misguided ‘conversation design’ metaphors.

Stuart Reeves, Transitional Assistant Professor, Horizon Digital Economy Research