Guardian: When the Guardian launched its Comment is free threads, it was one of the most exciting developments in journalism I had ever witnessed. Suddenly, everyone could play. Columnists and leader writers were no longer the voice of God: they could be immediately challenged, corrected, held to account. People with something to say could say it, expertise from every field and every part of the world was harnessed. The early discussions were invigorating, fascinating, thrilling. They forced me …