In WP's control panel, you have two options for comment moderation:
- An administrator must always approve the comment
- Comment author must have a previously approved comment
On a busy site, moderating every comment is daunting and time-consuming. But trolls and spammers often leave one nice, thoughtful-sounding comment to get in the door, then - if you have checked the second option - they have free range to leave all sorts of crud all over your blog before you can delete it all.
What I would love is a third option: "Comment author must have 10 previously approved comments" where you can set the "10" to whatever number you feel is appropriate. I think within 10 comments - maybe fewer - you have a sense of whether a commenter is bad news.
Is there any plugin or option or even core file edit that would enable me to set up something like this?