I think a big part in this is the wordpress comment section going no follow which stops spammers going an SEO advantage, my blog is do follow so i do get more spam, i try to avoid getting indexed in those "do follow" directory's as these bring alot of spam

1. NoFollow = NoWorky. Using NoFollow in blog comments, the original intent of the tag, does nothing to discourage comment spammers. Using other anti-spamming tools such as question, math and plugins such as Akismet and SpamKarma for Wordpress is much more effective.

2. If a blogger moderates comments, there is no need for a NoFollow attribute. “Everyone who passes a human inspection should get the link love.”

3. Since the use of NoFollow in comments on Wordpress blogs is default, many bloggers do not even realize they are using NoFollow.

4. NoFollow=NoValue. Why use NoFollow on sites, text ads, and blogs if there is no value in terms of search engine indexing? What if they made the Yahoo! directory nofollow? Would anyone continue to purchase listings? Obviously the value of that directory would be zero of nofollow tags were applied to the listings.

5. Linking to someone with a NoFollow attribute is a sign of not trusting them. It’s like reaching to shake someone’s hand, but stopping to put on a pair of latex gloves.

6. No Follow sucks because the search engines (particularly Google) can’t make up their mind about when and how it should be used, thus causing confusion among inexperienced webmasters who do STUPID things like No Follow ALL outgoing links from their website to “protect the site from page rank leakage” and other silly ideas.

7. No-follow is a poor search engine’s solution to conceal its own failure to rank websites appropriately. What’s next, No-linking?

Search engines should be able to develop a method of identifying and devaluing links to spam sites which were placed in blog comments. Why should everyone who posts in blog comments suffer from the actions of a greedy few spammers.

8. Commenting on a blog post is the same as adding more relevant to that blog post. A thought provoking one sentence post can lead to pages of comments. If someone takes the time to help build your site’s content via posting comments, it is professional courtesy to give them some link love.

9. Putting NoFollow on Wikipedia is like putting Grey Poupon on a Spam sandwich.(Or like putting perfume on a pig.)

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Thank you, you answered the question I have been searching for which was whether or not to place keywords when blog commenting.

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no one can prevent spam, i heat that

Since the use of NoFollow in comments on Wordpress blogs is default, many bloggers do not even realize they are using NoFollow.

i totlly agree with your opinion

Found the information worthy as I had no idea of posting a comment on the blog,.I keep seeing articles like these.

i really thankful for providing very good informations

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I want to mention that this post really forced me to do so. Really nice post! good job .. i like it!