[b]Who are the Iotas?[b/]
Iotas are Iota Phi Theta members.
This fraternity is a NPHC (National Pan-Hellenice Council) fraternity.

GLO?
GLO is Greek Letter Organization

Is it true that Thetas have a long history Kappa Alpha Theta was founded on Jan. 27, 1870, so it is certainly one of the older NPC (National Panhellenic Conference) groups. As for more exclusive, I guess it would depend on the chapter, the no. of rushees, etc.