The dataset comes with GPS locations of users and venues. With that data alone you can retrieve individual addresses in not too densely populated areas. Missing links will get caught in the social net.
We already learned that Warhol's 15 minutes of fame should read 15 megabytes , but, to cut the "it's the users choice to post that data" apologists short: almost no-one I speak to understands the implications of all possible interpretations, classifications and groupings that their online traces allow.
Furthermore, it's not the users' fault that 4sq isn't sufficiently rate limiting or otherwise protecting this data. Why should arbitrary users be able to see the social graph of others they're not friends with? Also, why should people outside of your immediate one-hop social graph be able to see your checkins?
Giving it to 4sq for data mining is different than giving it to UMN and/or the whole internet for data mining and/or deanonymization.
We already learned that Warhol's 15 minutes of fame should read 15 megabytes , but, to cut the "it's the users choice to post that data" apologists short: almost no-one I speak to understands the implications of all possible interpretations, classifications and groupings that their online traces allow.