Assuming that you’ve checked that trackbacks appearing in your comments aren’t spam, is there any SEO or link advantage to leaving them or deleting them?
Trackbacks for me is just a way of thanking bloggers who have linked to your blog, and help your readers find more stories talking about the topic of a specific blog post.
Although trackbacks are being badly abused these days, they still have some SEO benefit. Because take note, they still count as a link. The “nofollow” attribute is just used to stop PR bleeding and not to stop search engines from crawling the link.
So, I guess there’s no change in your search engine ranking if and only if you use the nofollow attribute in the trackbacks.
If I want to have sub domains e.g. for a multi author site, which is best and why? www.mysite.com/subtopic or www.subtopic.mysite.com
Let me fix the definitions first, www.mysite.com/subtopic is called a subfolder, a subfolder is considered by search engines a connection to the main site i.e. www.mysite.com. On the other hand, subdomains (topic.mysite.com) is considered a different site by search engines and they crawl it without the help of the main domain. (independently)
So for a multi author site, I’d suggest using a subfolder if all the topic is relevant to the main domain and if not, a subdomain is suggested.
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