The truth hit him when he waded into a forum debating creationism and ended up being attacked by both sides.

He argues that the fundamental problem of incivility on the internet has never gone away - in fact it has got much, much worse.

Four Thought is a series of thought-provoking talks in which speakers air their thinking on the trends, ideas, interests and passions that affect culture and society in front of a live audience.

Presenter: Ben Hammersley

Producers: Mike Wendling and Smita Patel.