Is 4chan the perfect Pirate Bay poster child to justify wider UK site-blocking?

The game Alpha Centauri had the most hard hitting quote that I think applies now.

"As the Americans learned so painfully in Earth's final century, free flow of information is the only safeguard against tyranny...Beware of he who would deny you access to information, for in his heart he dreams himself your master. Commissioner Pravin Lal, 'U.N. Declaration of Rights' "

> As the Americans learned so painfully in Earth's final century, free flow of information is the only safeguard against tyranny.

This had until recently been only tested for top-down information. Nowadays, everyone can be a broadcaster and we're seeing quite different results.

Free flow of information should be considered different from free flow of nonsense.

And who determines which is which? It is quite a hard problem.