Excellent web site. However, it is not quite accurate.
The site says
28 North-American Interfraternity Council Fraternities. It is the North-American Interfraternity
*Conference* and five of the chapters listed are not members of the NIC. It also says
15 National Panhellenic Conference Sororities, yet one chapter is not a member of NPC.
And yes, I know I can be a stickler for details. 