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Re:IPhone's Gay Social Networking App Leads to Murder of Pho... by frankus on Thursday April 29, 2010 @05:09PM (#1306060)
My guess would be Grindr or one of its clones.

Loopt, colorful popped collars notwithstanding, is not particularly gay.

Re:IPhone's Gay Social Networking App Leads to Murder of Pho... by shoesfullofdust on Thursday April 29, 2010 @06:13PM (#1306265)
"Correction: Phoenix P.D. Investigation Finds That Grindr iPhone App Not Involved in Yesterday's Murder"

http://blogs.phoenixnewtimes.com/valleyfever/2010/04/correct...