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Content predicts privacy? Photos with “person” tag All photos
Location predicts privacy? Users Public Locations Average Locations Private Locations Percent of photos
Meanwhile, in the paper
Does content predict privacy?
Does location predict privacy?
Number of photos in a location is a predictor, too.
Do users regret/revisit mobile privacy choices?
What about location disclosure?
Kinberg, Spasojevic, Fleck, Sellen
“ Social uses of camera-phones”
Nancy van House
Main Research Question
What are the main factors considered when making privacy decisions?
Reflective Photo Elicitation
Participant’s own photos
Used to study… photo-taking
Grounds study with actual behavior
Recruited and equipped 15 users
8 male, 7 female
Early 20s to early 50s (most in 25-35)
Some social connections
Discussed patterns and individual photo decisions
Security “ Pictures of the kids... I don’t know if I’d mark public... I don’t know who is out there”. “ If I did something to upset somebody somehow... and they knew where I lived by looking at my photos, that would bother me”. “ There is so much stuff out there, I don’t think I’m really a prime target.”.
Identity Management “ You’ve heard about all these random stories about people on MySpace/YouTube and a HR department will… find stuff” “ I might [upload] as family-only if it was a family event… embarrassing pictures of me and my aunt” “ Portland pictures. Ahh, there is a picture of me. Unflattering”
Sharing convenience “ I made my photos public so I wouldn't have to worry when I gave a friend the URL so they could browse my pictures freely”
Social disclosure “ I added the tag '[bar name]' so he'd know where I was…” “ Nothing marked [private]. It’s almost like the tree the in the forest, why would you take a photo if you didn't want anyone to see it.” “ if I went somewhere and I didn’t invite someone and I didn’t want them to see, I might want to make that [family-only]”.
Privacy Considerations Taxonomy
Taxonomy Breakdown *Warning: do not take these numbers literally.
Choice under uncertainty
Dealing with complexity
Too many considerations, options
Users often adopt blanket strategies
Users mostly unsatisfied, not regretful
Preventing mistake/reducing impact
Use cues to detect failures?
Staging/review area for recent uploads?
Information and feedback
Number and identity of potential viewers?
A “show me what they can see” option?
Decoupling discovery and sharing
Already done since on Flickr
How to discourage blanket strategies?
All Flickr/ZT photos,
Creative Commons License, or with author permission