HSOs (High School Organizations)

Soooo... out of curiousity... Were any of you, or are any of you, members of High School Organizations (HSOs)? Here in Memphis, they are kind if popular with the High School students... we have tons of them.. and they step, host parties, do their strolls and calls and all that jazz. They do they whole "pledging" process (lines) and initiaite members, community service projects, etc. etc. The less knowledgable people refer to them as "high school sororities/fraternities", though we always have to correct them because we are NOT and do not claim to be sororities/fraternities... although some of the male organizations are affiliated with some fraternities (Kappa League, NSI/Omega Prep). So I was just wondering if they were popular elsewhere or if any of you are/had been members of anything similar?