It's impossible to argue a point on Twitter without leaving an opening for debate.
It simply isn't possible to lay out a nuanced argument that addresses the main potential objections in less than 140 characters.
As a result, any tweet can be debated.
In some ways, this is bad, because it further contributes to our "Crossfire" society.
But in other ways, this is good, because it encourages debate and conversation.
I have no idea if this was intentional on the part of Ev, Biz, and Twitter's creators. But there is little doubt that this dynamic has helped make Twitter the addictive utility it is today.