Disabling comments on WordPress posts
Done to this site because of the amount of absolute garbage coming in.
To kill the ability to comment on all existing posts, hit your database and zap it thusly:
UPDATE wp_posts p SET comment_status = ‘closed’, ping_status = ‘closed’ WHERE comment_status = ‘open’;
To turn off future, log into WP and head to Settings > Discussion and uncheck Allow people to post comments on new articles.