Comment moderation

Most blogging software has the ability to add reader comments at the end of any blog post.

If you decide to allow comments, you also have to decide whether the comments go online right away, or whether you have to approve (or moderate) the comments before hand. It's also possible to turn off comments entirely.

With the spread of other places for commentary online (like Facebook and Twitter) it's not essential that you allow comments directly, since there are plenty of places for people to type.

Blogger's comment setup guidelines are here

http://support.google.com/blogger/bin/answer.py?hl=en&answer=42063

Wordpress on comment moderation:

http://codex.wordpress.org/Comment_Moderation

Typepad has a robust set of comment settings:

http://help.typepad.com/comment_settings.html