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Re:The Creepy Details of Facebook's New Graph Search by notahacker on Saturday January 19, 2013 @12:26PM (#5083966)
Marketers have certainly been able to do "people who added our app who are x and like x" queries for a while.

The only difference is that ordinary people can do it with their friends and no obscure query syntax.

Re:The Creepy Details of Facebook's New Graph Search by user24 on Saturday January 19, 2013 @04:32PM (#5084847)
That's not the only difference. There's a big difference between "Hey facebook, show my ad to singles who like dogs" and "Hey facebook, show my the profiles of people who are singles and like dogs".