I’ll close comments regularly on old posts now. Because I am sick sick sick of spam comments and sick of updating my kill list every day. This is worse than email spam. Just a few statistics to show you how sick I am of spammers: there are at least 10 swear words missing from the rest of the post because I (barely) managed to censor myself.
If anyone wonders how to quickly close all comments:
update wp_posts set comment_status='closed' where comment_status='open';
update I fixed my other blogs too, plus the ‘recent comments’ feature that was broken since version 1.2.x of wordpress.