Here are some WordPress plugins that can encourage comments.

BlogFollow - Shows a snippet of the commenter’s blog at the bottom of the comment.

DoFollow - Removes “nofollow” attributes from links in comments so search engines can follow them.

DoFollow Trackbacks - Removes “nofollow” attributes from trackbacks

Show Top Commentators - Lists the most frequent commentators on your blog, along with links to their blogs, in your sidebar.

Good job…!

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Here are some WordPress plugins that can help you eliminate spam.

Akismet - Antispam plugin from the creators of Wordpress that uses a central database of spam comments to flag spam. Requires a free API key from Wordpress.com

Spam Karma - Analyzes comments for spam based on a karma system.

Bad Behavior - Prevents spambots from even accessing your site by analyzing their HTTP requests.

Did You Pass Math? - Asks commenters a simple math question before their comments are posted.

Comment Timeout - Closes comments on old posts.

Good look…!