Here is the overlap for
Sigma Kappa. I found it interesting that we don't have one main "competitor", like Kappa and Theta are with each other, or ASA and AST, for example. I don't think it is surprising that Chi O and DZ top the list, since they have the most chapters, although, coming from UMD, those wouldn't have immediately come to mind, because we don't have Chi O or DZ and we have 4 toward the bottom of SigKap's overlap list (AEPhi, DPhiE, Phi Sig, and SDT). I guess Sigma Kappa just has chapters at all kinds of different schools.
CHI OMEGA: 49
DELTA ZETA: 49 (HuskyAlum got 47)
ALPHA CHI OMEGA: 41
ALPHA DELTA PI: 41 (match with honeychile)
DELTA GAMMA: 41 (match with dukedg)
ALPHA PHI: 40 (epchick got 41)
KAPPA DELTA: 39 (match with Leslie Anne)
PI BETA PHI: 35
ZETA TAU ALPHA: 33
ALPHA GAMMA DELTA: 32
GAMMA PHI BETA: 32
DELTA DELTA DELTA: 31
KAPPA KAPPA GAMMA: 29 (match with wildcatfan)
ALPHA OMICRON PI: 28 (match with AOII_Angel)
KAPPA ALPHA THETA: 27 (oldu got 26)
PHI MU: 24 (carolina blue got 23)
ALPHA XI DELTA: 22 (match with oldu) Soon to be 23 with AXiD coming to Illinois in Fall 08!
SIGMA SIGMA SIGMA: 19 (KSUViolet got 18)
ALPHA SIGMA ALPHA: 19 (match with cuteASAbug)
SIGMA DELTA TAU: 17
PHI SIGMA SIGMA: 14
ALPHA SIGMA TAU: 13
ALPHA EPSILON PHI: 11
DELTA PHI EPSILON: 7
THETA PHI ALPHA: 1 (match with AnatraAmore)