Keynote presentation from Prof. Guanling Chen, University of Massachusetts Lowell for MSM 2011 workshop

1. Sharing Location over Social Media
Guanling Chen
University of Massachusetts Lowell
http://www.cs.uml.edu/~glchen
glchen@cs.uml.edu

2. MSM 2011, Boston, MA 2

3. Dodgeball
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4. Brightkite, Gowalla
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5. Loopt, Google Latitude
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6. Foursquare
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7. Facebook Places
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8. Check-In
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9. Foursquare Check-Ins
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10. Why Check-In?
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11. MSM 2011, Boston, MA 11

12. MSM 2011, Boston, MA 12

13. MSM 2011, Boston, MA 13

14. MSM 2011, Boston, MA 14

15. Brightkite Study
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16. Data
– About two years Updates 4,460,161
– Daily Friends List 168 days
– Users Profile 70,337
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17. 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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18. Tag Cloud
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19. Classification
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20. 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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21. Gender
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22. Age
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23. # visited places
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24. Friends
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25. Influence
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26. Privacy Design
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27. Control & Feedback
Design for Privacy in Ubiquitous Computing Environments.
Victoria Bellotti and Abigail Sellen.
ECSCW 1993.
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28. Capture
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29. MSM 2011, Boston, MA 29

30. Construction
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31. Accessibility
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32. 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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33. 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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34. Public location
disclosure control
Business location
Cross boundary disclosure control
sharing control
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35. 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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36. Policy
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37. MSM 2011, Boston, MA 37

38. Mobile Usability Testing
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39. Android UI Framework
Dialog
Button Widget
(View Class)
AdapterView
(ViewGroup)
Menu
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40. Recorded Events
Recorded
Android
UI
Events
are
summarized
in
the
following
table,
classified
by
their
adhering
window
Unhandled Area
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41. State Machine Model
Expert
State
Machine:
Expert
States
and
Transi3ons:
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42. Traffic Flow Chart
User
Traffic
Flow
Chart:
Incoming
flow
Outgoing
flow
Flow
to
Mistake
States
Backtracking
flow
Mistake
States
and
Transi3ons:
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43. Reported Metrics
Signs
for
poten3al
usability
problems:
-­‐ Too
many
backtracking
-­‐ Par0cipants
cannot
complete
one
step
-­‐ Low
correct
flow
ra0o
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44. 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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45. Q&A
http://www.cs.uml.edu/~glchen/
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