I'm not using Facebook's definition of sex to include or exclude anyone. The link to Facebook is so I can check that each new member is real. Anyone who identifies as a woman is invited to join.
Do you use the Facebook link to verify that the person is female? I'm trans and out as a woman in a lot of places, including at the tech company where I work, but not on Facebook.
I do all verification manually. Please send me a note at cadran at ycombinator.com and we can discuss further.
Thanks!
I don't know why you're being downvoted. This is a legitimate concern.