In a recent Google Webmaster Blog post, a detailed information is given about how comment spamming can lower the rankings of any website in particular.
When someone posts a comment that is both irrelevant and posted just to pass the link so as to increase the number of inbound links to their website in particular, the rankings of both the sites will get affected in the process. This is applicable for those comments only that hold no relevance to the post and are completely unnecessary.

If you think a suspicious link has come from blogs and other platforms, you should check the URLs. In case you have created a spammy link, delete it or contact the webmaster to get it removed. After deleting the spammy inbound links, you can send a reconsideration request at Google Webmaster support. If you own a site that receives lot of comment spams daily, here are a few things you should do:
- Disallow all the anonymous postings.
- Turn on the comment moderation option.
- Disallow all the hyperlinks in comments.
- You should CAPTCHAs and other methods for preventing automated comment spamming.
- Use robots.txt or meta tags for blocking comment pages.
- You can also use “nofollow” attribute for linking in comment field.
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{ 31 comments… read them below or add one }
Long live google bowling. At least it's official now, they give the key to drop the ranks of competitor sites….
Comment spams can be avoided through Akismet plugin in Wordpress blog. Google is improving their ranking factors day by day. Now website load time will be also a major fact of ranking. But how Google will determine if anybody use this types of comments against competitor site?? Interesting..
Google has been remarkable in their marketing and services which there are providing to their user and have create the elite league.
Well comment spamming much improve now. i have notice that people put comment like this "Hi, I like your post and I already subscribe to your RSS. Keep up a good work". Well IMO, this kind of spam will not be catch by Google.
It's interesting that they made this announcement because it's something that they've been doing for some time now. Also, as someone above brought up, it seems like this may be used to penalize your competitors, which seems unfair.
I use Akismet plugin in my Wordpress blog. I hate when people post commenst that are totally irrelevant to the blog. Google is doing a good thing.
It's a bad idea to suggest to use nofollow in comments. Akismet is efficient, and you only have to moderate other comments if it's spam.
I totally agree with what Google is doing sometimes people actually have the nerve to post such comments as the ones that you showed us. I have no idea how they think they are going to get away with that. I am sure that most people know how to stop those spammers but if they don't they will now.
Hi,
Thats true people sometimes pass comment which is not related to blog.To catch the spam comments i think Akismet is the best way.I always advice for your blog you install Akismet to help filter unwanted SPAM comments.
What goes around, comes around, as they say. People who post comments should remember the Golden Rule: Do To Others What You Would Want Them To Do To You. That way we'll be playing nice…
Uh, Hey great post! I like your site. Just kidding. Anyway i use tantan noodles spam filter for wordpress. Its seems to work great.
I agree with Parka Boyd,people must remember the golden rule while posting comments……
By the way gained some huge knowledge.
I hope my blog will not get lower as you said.
Those comment are pretty obvious, surely any admin will spot and delete them before any harm is done?
Hi guys
http://www.aresvista.com website may be harmful to your computer.Any music files,movies files can not share through this website..this website is not licensed..
this website is fake..and spyware relevant site.
Regards
LAZY
Google fighting spams great.
Recently, I just read from a website that outbound link from your site does not affect your page rank. The best examples on this are the spammed .edu and .gov sites. Their PR never goes down. I forgot the url of the site that explains this. I will find it back and share it here.
I found a site that further explains the effects of outbound links. I don't know if the information is up to date because I can't find the date posted. Here's the link: http://pr.efactory.de/e-outbound-links.shtml
I was not really aware that an outbound link could affect the ranking of any site involved. Many are still doing it and it seems like they are not really affected and bothered by that strategy.
Yeah, finally Google is helping us out and helping out itself. Spiders are more intelligent and knowledgeable now to classify good or bad.
So, this is a google way to penalize your site if you are going to spam another site. I think it is time to keep away from those spammed sites.
Very good !!! googlele is amazing. Two years agos i was trop one of forum because of spamming.
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It's really a very good article,I learn so much thing from it,thanks.You are really a nice person.
Outbound links from your site does not affect your page rank. But I didn't know about spamming other websites will lower you PR until now. This needs to be proven.
This is good news for good commentators. And bad news for spammers. However, what if there is a certain competitor that wants his competition to be owned by him does google have this kind of approach on someone who would likely spam using his competitors website?
Yes ,you are right . Comment spammers are too much active . I use twenty theme and I used to allow comments . After some days , I followed some people commenting randomly and they were not content relevant. I banned the IP address from where the comments were coming . But doing so means sometimes blocking some unique visitors too . After that I blocked the comment feature totally . But the problem is that it closes inter action with visitors .So ,the process is not good to apply. Now , I'm using Disqas commenting feature and I have been able to kick the unethical commentators off my site.
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Thank you for the article. Very usefull about spamm. The google cleaver and the find the way to protect users.
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