• Time plays an important role in privacy management.

• Willingness to share decreases with time. • Time affects different aspects of our lives, which in turn affect our sharing preferences. • Possible reasons for the decrease in willingness to share: “staleness” and anachronism. • Suggested mechanism: reviewing aged content.

Eternal Sunshine? Longitudinal Privacy in Online Social Networks

Oshrat Ayalon and Eran Toch {oshratra, erant}@post.tau.ac.il, http://toch.tau.ac.il

Would you like that posts you are publishing today will be seen on your Facebook Timeline, in

five years from now?

• Between-subjects user study (n=298) • Recruitment:

Our Facebook application research framework

1. INTRODUCTION

2. METHODOLOGY

3. MAIN RESULTS

Willingness to share decreases with time.

Present time privacy

(boyd, 2007; Stutzman,

Gross and Acquisti, 2013)

Our study Regrets

(Wang et al., 2011)

Publication Time 1 year 2 years and more

Years 0-1 1-2 2+

Changes in social circles result in a decrease in willingness to share.

A post is becoming less representative with time.

4. CONCLUSIONS

The impact of time is stronger for young users.