Ariella Furman had a hard time connecting with the LGBT community when she relocated from New York to Pittsburgh, Pa., several years ago. There are fewer bars aimed at lesbian women than at gay men, she says. Anyway, she tends to prefer structured events to spontaneous bar gatherings.

In response, Furman launched a monthly party for LGBT women in the area. The mailing list ballooned to 4,000 members, with hundreds of women turning up every month and local bars vying to host the events.

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