The document summarizes research into people's online photo sharing habits and considerations around privacy. It found that content, location, and number of photos shared in a location can predict privacy settings. Interviews with users found they consider security, identity management, sharing convenience, and social disclosure when setting privacy levels. Users often adopt blanket strategies due to complex privacy options, and are mostly unsatisfied but not regretful of their choices.

1. Over Exposed? Privacy Patterns and Considerations in Online and Mobile Photo Sharing Shane Ahern, Dean Eckles, Nathan Good, Simon King, Mor Naaman*, Rahul Nair Yahoo! Research Berkeley

2. What do you get when you mix… Camera- phones Context People Instant Web Upload

4. Flickr: Privacy

5. Flickr: Discovery

8. Why Tag? Bay Bridge, Fog, [San Francisco, 94105]

9. Why Tag? RedSox, Fenway, GreenMonster, [Boston, 02215], …

10. Why Tag? Horsetails, handicapped, sign, [Stanford, 94305], …

11. Why Tag? mirror, me, Jenn, [New Haven, 06473], …

12. Why Tag? Sushi, Gills, Home, Shepherds bush, badger towers , [London, UK], …

15. Content predicts privacy? Photos with “person” tag All photos

16. Location predicts privacy? Users Public Locations Average Locations Private Locations Percent of photos

23. Interview Findings

24. 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.”.

25. 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”

26. 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”

27. 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]”.

28. Privacy Considerations Taxonomy

29. Taxonomy Breakdown *Warning: do not take these numbers literally.