SA backs Semenya ahead of 800m run
International media has questioned the athlete's eligibility to compete at the Games.
There have been questions - mostly from the international media - about Semenya's physicality and her eligibility to compete in women's events at the Games.
The former world champion has a condition that elevates her testosterone levels. Six years ago, the International Association of Athletics Federations subjected Semenya to gender tests but she has since been cleared to compete by the athletics body.
But South Africans and people from across the continent are having none of the questioning of Semenya's eligibility to compete.
Twitter users have hit back with hashtags like 'Hands off Caster' and 'Caster for Gold' encouraging the athlete who is in a bid to win gold.
Social media user Jackie Mondie has written a poem titled 'Caster is Mokgadi' in honor of the athlete.
The piece has gone viral over night.
Another poem by Sunny Morgan has also been shared on social media.