Search in social networks with access control
Truls Amundsen Bjørklund, Michaela Götz, Johannes E. Gehrke · 2010
More and more important data is accumulated inside social networks. Limiting the flow of private information across a social network is very important, and most social networks provide sophisticated privacy settings to control this flow. Creating such extensive access control knobs makes the search for content a hard problem since each user sees a unique subset of all the data.