Title: Geotagging reveals not only where you are, but also people you might knowhttp://www.news.cornell.edu/stories/Dec10/PhotoFriends.html
[Summary]
1.as few as three "co-locations" at different times and places could predict with high probability that two people posting photos were socially connected
2. This probability increases as the analysis moves to smaller areas and shorter time spans.
3. bias to handle:
- people make friends with whom posted photos at the same time,same online sharing websites
-> sol:: only compared photos posted after a certain date only with social links established before that date
- people with many social contacts on Flickr might be more likely to geotag their photos
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