Jennifer Moss and Stefanie Kegel, both co-founders of their small design studio started Ladies who Lunch out of a personal need. They decided they had complained long enough and so they came up with a solution for their source of complaint: who is free for lunch?
Here's the whole story: http://www.thegeekettez.com/may-we-introduce-ladies-who-lunch-connecting-working-ladies-during-lunch-breaks/