Sharists are those people who spend their time on Facebook just sharing posts. They are usually single, hence all the free time to bore us with their useless posts.
Ever since they dumped her, she's been a big sharist on Facebook.
Sibeko is a term that has been used to refer to a drunkard. This is due to a character from the famous South African sitcom, Emzini wezinsizwa, who was always drunk.
Now Sibeko is synonymous for drunkard.
Why did you give him money, don't you know he's a Sibeko?