Final answer:
The first Greek social fraternity was Phi Beta Kappa, founded in 1776 at the College of William & Mary in Williamsburg, Virginia. It began as a social organization and later became an honor society.
Step-by-step explanation:
The first Greek social fraternity is generally considered to be Phi Beta Kappa, founded on December 5, 1776, at the College of William & Mary in Williamsburg, Virginia.
It was established to provide a space for students to gather and discuss topics such as literature, philosophy, and other areas of scholarly interest. While Phi Beta Kappa started as a social fraternity, it evolved into an honor society by the nineteenth century.
Similar to how the Greek poleis established Panhellenic games to unite various city-states, fraternities and sororities often serve to unite students with shared interests and values across collegiate campuses.