What are the elite sororities?

You're right Kappa-girl. Several different groups claim to be the "oldest." I think the way it goes is ADPi was the first secret collegiate society for women. Pi Phi was the first to expand to another school, making them the first national. Also Theta was the first to found themselves with a greek name and specifically modeled after the men's groups. Therefore, they all claim to the first - and I guess they are all sort of right.