Sometimes gay men talk about the "Grindr Effect," because that gay hookup app reveals all sorts of secret things about supposedly homophobic or "gay-free" areas.

For example, in the Detroit area of the United States where I used to live, a certain city (Dearborn) is majority Muslim. The culture there is not overwhelmingly conservative or anything, but being Muslim, gay men supposedly don't really exist.

Until you open Grindr, that is! ;-)