important aspect of SEO . How a site treats links is important because it can determine how search engines treat those links as well. Specifically, I’m talking about whether a site uses NoFollow tagging within its links.
This includes the HTML tag, the URL the link will be going to, the text that will be shown on the webpage for that link, and the closing HTML tag.
What do NoFollow and DoFollow mean?
Why Does Nofollow Matter?
“In general, we don’t follow them. This means that Google does not transfer PageRank or anchor text across these links. Essentially, using nofollow causes us to drop the target links from our overall graph of the web. However, the target pages may still appear in our index if other sites link to them without using nofollow, or if the URLs are submitted to Google in a Sitemap. Also, it’s important to note that other search engines may handle nofollow in slightly different ways.”
Should You Use DoFollow Links
Google calls this untrusted content. They think since you don’t know who’s trying to comment on your site (for Pete’s sake, they could be a spammer) you should just automatically nofollow all those links and it will hopefully discourage spammers from commenting at all. It’s worth a try and may cut down on a little of your spam comments, but if you've run a blog for even a week, you already know it won’t get rid of it.
Using a nofollow tag to link to these pages is not a sure-fire way of keeping the pages out of the search engines, but it may help. You might as well use the nofollow tag on those links as you don’t really want the search engines following them to your exclusive pages.