MSM 2011 keynote

Sharing Location over Social Media

Guanling Chen University of Massachusetts Lowell

http://www.cs.uml.edu/~glchen glchen@cs.uml.edu

MSM 2011, Boston, MA 2

MSM 2011, Boston, MA

Dodgeball

3

MSM 2011, Boston, MA

Brightkite, Gowalla

4

MSM 2011, Boston, MA

Loopt, Google Latitude

5

MSM 2011, Boston, MA

Foursquare

6

MSM 2011, Boston, MA

Facebook Places

7

MSM 2011, Boston, MA

Check-In

8

MSM 2011, Boston, MA

Foursquare Check-Ins

9

MSM 2011, Boston, MA

Why Check-In?

10

MSM 2011, Boston, MA 11

MSM 2011, Boston, MA 12

MSM 2011, Boston, MA 13

MSM 2011, Boston, MA 14

MSM 2011, Boston, MA

Brightkite Study

15

MSM 2011, Boston, MA

Data

– About two years Updates 4,460,161 – Daily Friends List 168 days – Users Profile 70,337

16

MSM 2011, Boston, MA

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.

17

MSM 2011, Boston, MA

Tag Cloud

18

MSM 2011, Boston, MA

Classification

19

MSM 2011, Boston, MA

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.

20

MSM 2011, Boston, MA

Gender

21

MSM 2011, Boston, MA

Age

22

MSM 2011, Boston, MA

# visited places

23

MSM 2011, Boston, MA

Friends

24

MSM 2011, Boston, MA

Influence

25

MSM 2011, Boston, MA

Privacy Design

26

MSM 2011, Boston, MA

Control & Feedback

Design for Privacy in Ubiquitous Computing Environments. Victoria Bellotti and Abigail Sellen. ECSCW 1993.

27

MSM 2011, Boston, MA

Capture

28

MSM 2011, Boston, MA 29

MSM 2011, Boston, MA

Construction

30

MSM 2011, Boston, MA

Accessibility

31

MSM 2011, Boston, MA

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.

32

MSM 2011, Boston, MA

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.

33

MSM 2011, Boston, MA

Public location disclosure control

Business location disclosure control Cross boundary

sharing control

34

MSM 2011, Boston, MA

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

35

MSM 2011, Boston, MA

Policy

36

MSM 2011, Boston, MA 37

MSM 2011, Boston, MA

Mobile Usability Testing

38

MSM 2011, Boston, MA

Android UI Framework

Dialog

Button Widget (View Class)

AdapterView (ViewGroup)

Menu

39

MSM 2011, Boston, MA

Recorded Events

Recorded  Android  UI  Events  are  summarized  in  the  following  table,  classified  by  their  adhering  window  

Unhandled Area

40

MSM 2011, Boston, MA

State Machine Model

Expert  State  Machine:  

Expert  States  and  Transi3ons:  

41

MSM 2011, Boston, MA

Traffic Flow Chart User  Traffic  Flow  Chart:  

Mistake  States  and  Transi3ons:  

Incoming  flow  

Outgoing  flow  

Flow  to  Mistake  States  

Backtracking  flow  

42

MSM 2011, Boston, MA

Reported Metrics

Signs  for  poten3al  usability  problems:  

-­‐ Too  many  backtracking  

-­‐ Par0cipants  cannot  complete  one  step  

-­‐ Low  correct  flow  ra0o  43

MSM 2011, Boston, MA

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.  

44

MSM 2011, Boston, MA

Q&A

http://www.cs.uml.edu/~glchen/

45