How to setup WordPress Discussion Settings or Comments.
Trackbacks allows you to communicate to another blog or blog owner using your WordPress
Pingbacks are sent automatically when you link to someone’s site or they link to you.
Other comment settings
I dont allow comments on my websites as a rule.
My settings are: Comment author must fill out name and email.
Users must be registered and logged in to comment.
set to 0 days
Email me whenever
A comment is held for moderation
Before a comment appears
Comment must be manually approved.
Comment author must have a previously approved comment
I hate spam so hold a comment in the queue if it contains or more links. (A common characteristic of comment spam is a large number of hyperlinks.)
Below are avatar settings