NiemanLab has the article This site is “taking the edge off rant mode” by making readers pass a quiz before commenting.

The team at NRKbeta attributes the civil tenor of its comments to a feature it introduced last month. On some stories, potential commenters are now required to answer three basic multiple-choice questions about the article before they’re allowed to post a comment.

This sounds like s great idea. I might be able to open this blog to more comments if I had a tool like this.

NRKbeta developer Henrik Lied built the tool as a WordPress plugin, with the questions randomized for each user.

I’ll have to see if the plugin is available.