Many people have jumped on the bandwagon of comment spamming in an attempt to raise up their ranking in google and while the search engines are not fully capable to devaluing all the spam, they are working towards elimination of comment spamming and penalization of sites to which the links point to.

It might be the end of high pr blog commenting as people will see less and less value in these links and for people who have seen their sites penalized, they are asked to get rid of the spammed comments and request a reconsideration in GWT.

source: http://googlewebmastercentral.blogspot.com/2009/11/hard-facts-about-comment-spam.html

oes tsetnoc also facing daily lot of spam comments too, we hope this step of google help lot og bloggers to control comment spaming

Here are some tips suggested by google to avoid spamming:

Comments can be a really good source of information and an efficient way of engaging a site’s users in discussions. This valuable content should not be replaced by gibberish nonsense keywords and links. For this reason there are many ways of securing your application and disincentivizing spammers.

• Disallow anonymous posting.
• Use CAPTCHAs and other methods to prevent automated comment spamming.
• Turn on comment moderation.
• Use the “nofollow” attribute for links in the comment field.
• Disallow hyperlinks in comments.
• Block comment pages using robots.txt or meta tags.