I know that there were some comments about people making houses that used NPC sorority names, but I'm short on time and kind find it to quote it.
Anyways, I was using a website for work called Polyvore, where you can make collages and stuff. I got curious and searched what items were listed under "Alpha Xi Delta". A few pictures of pools, some blue and yellow butterflies and a couple of sets of letters came up in the results. I clicked on one of the pictures of a pool, and saw it was posted by a girl with the user name "taylor.miss.alpha.xi.delta". I click on the user, and she describes herself as a 16 year old who founded the sorority Alpha Xi Delta.
I tried a couple other GLOs and found similar results for Kappa and Zeta, however, the person who had originally posted those pictures no longer had a profile.
My guess was that this person was using polyvore to make a college for their SL sorority (The picture of the pool, and the houses and rooms for Zeta and Kappa, I'm guessing were pictures of the "house"). I think I wouldn't mind as much if she wasn't blue and yellow as well...
ETA: Okay, so I searched groups for Alpha Xi Delta and found 3 results. One group used "realize your potential". Another claims: "These girls have the grades, the looks, leadership and hot body's. These girls participate in many sports, but also aren't afraid to party hard. Sisterhood and friendship are the most important. Out Moto is "Hoes before Bros". Though this is our moto, this doesnt mean boys aren't important, cause they are. These girls date the hottest boys on campus, and aren't afraid to get down and dirty. Image is not everything."