Comments after switching to WordPress

I have notices something interesting after making the switch to WordPress.  Many of my older posts are now being commented on with a higher frequency than they were with LifeType.  I think that there are some potential reasons for this

1. LifeType had a Bayesian spam filter.  It is possible that it was trained poorly over time, so these comments were marked as spam and deleted immediately


2. There could have been a bug in the other spam filters, which would have deleted those comments.


3. Since I am submitting a new sitemap for the WordPress blog, the posts could see "fresher" and could appear higher in search results.