With respect to TBL, he seems to be suggesting censorship. Twitter is designed to allow users to spew whatever arises in their minds, and to retransmit the ideas of others that you believe others should see. Who decides what's "reasoned debate" when it comes down to it?
It's been shown that human nature gravitates towards sensationalism. The craziest of rumors always travel the fastest and the furthest. The free speech model of Twitter, for better or for worse, only amplifies this tendency by making so much easier for it to happen.
Give everyone a soap box, and you get a lot of noise pollution.