@paulag and @blockops

On having to log in on WordPress sites: that is controlled by the site owner who can choose whether or not to have that option on. I used to have it on, but it discourages comments so I've turned it off. By and large, on WP, Askimet picks up any spam which was my major concern. Oh, and also on WP, there are filters you can use to pick up spam and/or the types of comments you don't want. All in the settings - Jetpack, I think.