  Privacy in Online Social Networks (OSNs) evolved from a niche topic to a
broadly discussed issue in a wide variety of media. Nevertheless, OSNs
drastically increase the amount of information that can be found about
individuals on the web. To estimate the dimension of data leakage in OSNs, we
measure the real exposure of user content of 4,182 Facebook users from 102
countries in the most popular OSN, Facebook. We further quantify the impact of
a comprehensible privacy control interface that has been shown to extremely
decrease configuration efforts as well as misconfiguration in audience
selection.
  Our study highlights the importance of usable security. (i) The total amount
of content that is visible to Facebook users does not dramatically decrease by
simplifying the audience selection interface, but the composition of the
visible content changes. (ii) Which information is uploaded to Facebook as well
as which information is shared with whom strongly depends on the user's country
of origin.
