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Dear Marieke,

See Nancy Howell Lee's book/dissertation, The Search for an Abortionist, 
from 1960s.

Michel Grossetti in Toulouse calls such searches, relational chains.

Reference group theory also seems appopriate.

   Barry Wellman
   FRSC		              NetLab Network              INSNA Founder
                      Faculty of Information (iSchool)
   University of Toronto                          Toronto Canada M5S 3G6          twitter: @barrywellman
   NETWORKED:The New Social Operating System. Lee Rainie & Barry Wellman
   MIT Press        Print $15  Kindle $9

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