Some just turn comments off for their blog but to me that eliminates one of the great features of making your blog interactive for your visitors. Comments can open discussion between the reader and the blogger. Your blog's visitors can even subscribe to a post's comments, getting notified of any new comments, keeping your readers coming back.

The WordPress plugin, Akismet checks comments posted on your blog posts against the Akismet web service to see if they look like spam or not.

To activate Akismet from your WordPress blog dashboard, click Plugins, scroll down and click Activate next to the WordPress Akismet plugin. After you do that you will see a box near the top of the dashboard that reads:

Akismet is not active. You must enter your WordPress.com API key for it to work.

Click the link in the message, and then the Akismet Configuration panel will open. You should then see this in the middle of the screen:

Please enter an API key. (Get your key.)

On the top of that page click the Sign Up tab, fill in your information and if you have a self-hosted blog choose the Just a username, please option.

Be sure to use a good email address in here to get your login information and WordPress API key, click the box to agree to legal junk and click next.

Check your email and click the confirmation link from WordPress to activate your account. You should then see a page that reads, "Your account is now active!" Click the login link within the text of that page and login.

You should now be at the WordPress.com site, if so click the dropdown box on the very top right of the page and choose "Edit Profile", now you are in the Global Dashboard.

Within the WordPress Global Dashboard you can now see your WordPress API key on the right side of the page. Oh, and by now you should have also got the API key in an email from WordPress also! But you should still edit your profile while you are in the Global Dashboard.

Now its time to place the API key in the Akismet WordPress plugin; go back into your WordPress blog dashboard, click the link on the Akismet WordPress plugin warning box near the top of the dashboard. Paste the WordPress API key in the box and click update options.

If the warning box is not visible check to see if Akismet is activated, click Plugins and look for the status of the plugin on the right. You will notice that all activated plugins are highlighted green. When Akismet is activated you can configure it by clicking Plugins, and look for the Akismet subpanel (white text in the dark blue bar) directly below and to the right of then main panel menu.

Keeping comment spam out while allowing your blog visitors to comment, will not only keep your blog clean but more interactive and help generate more traffic.