Which sorority is the first?

[33girl]

I think it goes like this:
-ADPi was the first secret society founded for women. (they didn't become national or use Greek letters until well after their founding)
-Pi Beta Phi was the first society founded with the intention to become national.
-Kappa Alpha Theta was the first group to use Greek letters from the beginning.
-Gamma Phi Beta was the first to use the newly coined word "sorority."

So there are quite a few "firsts" in there.