Sniping around these topics highlights the intensifying battles in Zimbabwe's faction-ridden ruling party over who will succeed President Robert Mugabe, in power for 36 years.
Mugabe, the world's oldest head of state, recently warned officials of his ZANU-PF party to stop insulting each other.
A lot of the bitter quarrels, which come ahead of Mugabe's 92nd birthday on Feb 21, happen on Twitter and other social media platforms, providing Zimbabweans with a stream of nasty, colorful and sometimes entertaining quips that would have been unthinkable not long ago.
"It has become so heated because Mugabe has deliberately kept the lid on the discussion," Shumba said.
In a new challenge to Mugabe, his former vice president, Joice Mujuru, this month registered a rival political party and plans to run for president in elections scheduled for 2018.