msm 2011 keynote
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Sharing Location over Social Media
Guanling Chen University of Massachusetts Lowell
http://www.cs.uml.edu/~glchen glchen@cs.uml.edu
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Dodgeball
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Brightkite, Gowalla
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Loopt, Google Latitude
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Foursquare
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Facebook Places
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Check-In
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Foursquare Check-Ins
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Why Check-In?
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Brightkite Study
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Data
– About two years Updates 4,460,161 – Daily Friends List 168 days – Users Profile 70,337
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Characteristics
Analysis of a Location-Based Social Network Nan Li and Guanling Chen International Symposium on Social Intelligence and Networking (SIN) Vancouver, Canada, August 2009.
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Tag Cloud
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Classification
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Proportion of Protected Updates (PoPU)
Sharing Location in Online Social Networks Nan Li and Guanling Chen IEEE Networks Special Issue on Online Social Networks, 24:5, pages 20-25, September-October 2010.
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Gender
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Age
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# visited places
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Friends
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Influence
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Privacy Design
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Control & Feedback
Design for Privacy in Ubiquitous Computing Environments. Victoria Bellotti and Abigail Sellen. ECSCW 1993.
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Capture
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Construction
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Accessibility
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Purposes
Analyzing Privacy Designs of Mobile Social Networking Applications Guanling Chen and Faruq Rahman IEEE/IFIP International Symposium on Trust, Security and Privacy for Pervasive Applications (TSP). Shanghai, China, December, 2008.
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UI Usability
A Toolkit for Usability Testing of Mobile Applications Xiaoxiao Ma, Bo Yan, Guanling Chen, Chunhui Zhang, Ke Huang, and Jill Drury The 3rd International Conference on Mobile Computing, Applications, and Services (MobiCase) Los Angeles, CA, October 2011.
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Public location disclosure control
Business location disclosure control Cross boundary
sharing control
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User can control whether to share this Check-in with friends inline
User can control whether to share this Check-in to Facebook or Twitter inline
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Policy
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Mobile Usability Testing
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Android UI Framework
Dialog
Button Widget (View Class)
AdapterView (ViewGroup)
Menu
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Recorded Events
Recorded Android UI Events are summarized in the following table, classified by their adhering window
Unhandled Area
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State Machine Model
Expert State Machine:
Expert States and Transi3ons:
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Traffic Flow Chart User Traffic Flow Chart:
Mistake States and Transi3ons:
Incoming flow
Outgoing flow
Flow to Mistake States
Backtracking flow
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Reported Metrics
Signs for poten3al usability problems:
-‐ Too many backtracking
-‐ Par0cipants cannot complete one step
-‐ Low correct flow ra0o 43
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Evaluation Usability Problems idenFfied by Event Logging Tool:
* Numbers in parenthesis are problems idenFfied by Laboratory-‐based Usability tesFng method:
-‐ Good at iden3fying cri3cal (major and catastrophe) usability problems.
-‐ Not good at iden3fying cosme3c usability problems.
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Q&A
http://www.cs.uml.edu/~glchen/
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