The campus paper at the U of Illinois recently ran an article asserting that the school's Greek system is the largest in a) the Big Ten, and b) the world. A small graphic / list accompanying the article gives some data about the eleven schools in the Big Ten. Looks like Penn State may have the highest percentage of students in its Greek system in the Big Ten, while Minnesota -- with just a sliver over 4% -- has the smallest.
Not that size is the be-all and end-all, by any means. (I tend to root for the brotherhood / sisterhood aspect and strong lifelong friendships, not chapter or system size.) Still, for those interested in some data, FWIW,
see:
http://www.dailyillini.com/features/...t-in-the-world