One of the most important elements of a successful blog is the community of readers that grows around it. At the heart of that community is a conversation that occurs by way of comments left on your blog posts. With that in mind, it’s essential that you set up the commenting feature on your blog before you publish any content. Figures below show the Comment configuration page accessed from the Comment tab within the Settings section of the Blogger dashboard.
The following settings should be configured up front:
1. Select the appropriate radio button to show (or hide, if you prefer) comments on your blog posts. The most popular blogs allows comments, so take some time to think about your blogging goals before you decide whether you want to allow people to comment on your blog posts. See the sidebar to learn more about the importance of blog comments.
2. Select a radio button to configure the Who Can Comment option on your blog. You can allow anyone to comment on your blog: only registered OpenID users, only users with Google accounts, or only members of your blog (people that you give access to read your blog on the permissions Settings tab described later in this chapter, in the section “Assigning permissions”).
3. Select a Comments Default for Posts setting from the drop-down menu. Choose whether you want new posts to allow comments by default. You can change this setting in the future for specific posts.
4. Select the appropriate radio button to show (or hide, if you prefer) backlinks within the Comments section of your blog posts. Backlinks appear as comments on Blogger posts and provide a “tap on the shoulder” from another Blogger blog to you, showing that Blogger blog linked to you in a published post. Backlinks are a helpful way to develop relationships with other bloggers and find like-minded bloggers. With that promotional opportunity in mind, most bloggers choose to allow backlinks.
5. Select a Backlinks Default for Posts setting from the drop-down menu. You can determine whether you want all new posts to allow backlinks within the Comments section by default by configuring this setting. You can change this setting in the future for specific posts.
6. From the Comments Timestamp Format drop-down menu, select the way you want the time that comments are published on your posts to display on your blog. Each comment left on one of your blog posts is published along with the time it was originally entered. Changing the timestamp format alters how that time appears on your blog.
7. Enter a message to precede the Comment area in your blog posts in the Comment Form Message box. This message appears above the comment form on all your blog posts. It can be used to invite people to comment on blog posts.
Engaging your readers with blog comments.
If blog posts are a blog’s heartbeat, blog comments are the veins and arteries that keep blood pumping to and from the heart of a blog. Comments make a blog an interactive and social medium. Show your readers that you value them and their comments by responding promptly to every comment left on your blog. Ask readers to leave comments on your blog posts to invite conversation, and then make an effort to keep that conversation going. By engaging your readers in conversation, you develop a strong blog community of loyal visitors.
8. Click the Always, Only on Posts Older than 14 Days, or Never radio button to enable Comment Moderation. Comment moderation is a helpful way to reduce spam comments on your blog. As new comments are left on your blog posts, they appear on your dashboard for you to review and approve before they’re published for others to see. This technique gives you the opportunity to delete spam or offensive comments.
Dealing with blog comment spam
Blog comment spam is typically defined as comments left on blog posts for no reason other than to drive traffic to a link provided in that comment. Blog comment spam may include nothing but links, or it can include an irrelevant comment as well as one or more links. Note that many people leave valid links in the comments they publish on your blog posts. Be sure to review each comment to identify which links are valid and which are spam. By deleting spam comments, you create a better user experience for your readers.
9. Click the Yes or No radio button to indicate your preference for the Show Word Verification for Comments option. Word verification is an excellent way to block comment spam. Each person who leaves a comment on one of your blog posts is given a word to enter into the comment form in order to be able to submit that comment.
10. Select whether you want to show profile images on comments by clicking the Yes or No radio button. If you want other Blogger users’ profile pictures to be displayed with their comments on your blog posts, select Yes. Otherwise, choose No.
11. Enter an e-mail address in the Comment Notification Email text box. If you want to be notified by e-mail whenever a new comment is awaiting moderation, simply enter your e-mail address in the Comment Notification Email box, and an e-mail is sent to you automatically when each new comment is submitted. You can enter as many as ten e-mail addresses (separated by commas) in this field.
12. Click the Save Settings button to save any changes you made on the Comments page.
James Cage is a self taught web blogger and developer. He is the founder of Blogging Inspiration. You can connect with him on twitter @ james_cage 
nice post.