lMost of the major free/low-cost blogging software
(Wordpress, Blogger,
Movable Type, Typepad, etc.) offers some kind of comment authentication
lThis can allow you to filter out most of the spam
comments--but it’s not
foolproof, and it won’t keep human commenters who are intent on creating mayhem away from your
blog
lAnother option: require registration for comments, or
require moderator approval
before comments go live on the site.
lRequiring registration may discourage some people from
posting their comments
lModerator approval is labor-intensive if your blog
becomes popular