sorority tiers

Kappa remains number one because they're hot and therefore very exclusive during recruitment and are a favorite of both pike and theta, which are top frats
Sigma kappa is second because they also are extremely selective during recruitment, due to the high volume of girls that want them. They mix with all the top frats and are liked by many of them including theta, phi sig, and recently pike

Sigma delta tau is either third or fourth, interchangable with chi o. They aren't as wanted during recruitment as the top two but have a very chill vibe once girls are through initiation and often get to mix with top tier frats. They aren't as favorited by the frats but liked enough.
Chi omega is a very typical sorority feel, usually the girls who got cut from kappa and sigma kappa. Nice enough despite the few mean girls on this site. Friends with theta after Greek week and now that their social probation is over they will mix more.

Axo is only bottom tier for now as they're a group of very nice girls and are slowly getting more popular. A bit awkward but sweet and starting to mix with better frats.
Igu is not by any means a bad sorority, just different than the others. Offers a different vibe than the typical sorority ideals.