Nearly two decades ago, Vernon Koekemoer became South Africa’s first social-media sensation. If you’re too young to remember, here’s a quick lesson in naughties pop culture. The year was 2008. Facebook wasn’t only for your parents and pre-X Twitter was a baby bird learning to screech. And no one knew it, but South Africa was about to produce an internet icon … Vernon Koekemoer – real name Cassie Booyse – is a 51-year-old bodybuilder from Benoni.…