how should you do it for SEO: domain.com/blog or blog.domain.com?

/blog .
Install Wordpress in subdirectory and you can use and enhance the authority of the main domain directly.
 
This is for a large organization site.
Depends, Google treats sub domains as a new domain. So, if you want to benefit from your domain authority I would recommend domain.com/blog . If for some reason you want to separate it completely, go for a subdomain . But in my opinion, a subfolder will do just fine
 
Also consider that you might have to buy an expensive SSL certificate for wildcard subdomains. With just one domain, it's cheaper for https.
 
There are very few benefits to doing it on a sub-domain and a lot of benefits to building out your blog in a sub-directory of your existing site. For example you won't have to worry about updating two different domains which is especially helpful when it comes to mobile. Any link authority you had on the main domain will not be passed along in full to your blog if you build it on a sub-domain. It's also going to be more of a headache to manage in general because you essentially have two sites. And if the blog takes off then you are at a disadvantage because it is separate from your main website. Unless there is some compelling reason to make it a sub-domain, just keep it simple and stick your blog installation in a sub-directory.
 
go with domain.com/blog. Here's the reason why:
- Google will crawl new blog post typically within the days of launch.
-Backlinks and social mentions generated by the content on your blog can help other contain on the domain.
-Blog inherits the authority of parent site so can rank immediately for terms within posts.
-Integrates better with main site for a better user experience.
-Easier to track with Google Analytics.
 
I'd go for "/blog".

I don't have a technical explanation that will support this choice, however. I've noticed that it's the norm among websites.
 
Go with /blog, otherwise it is seen as a new domain by Google. That's why sites like wordpress.com can give out blogs without crashing the trust of their own main domain.
 
I have read all the replies. Are subdomains really not given any boost? A while ago I thought I read about people buying authoritative domains and making a bunch of subdomains to point them to other sites, didn't I?

I will make it in its own folder.

The other thing I wanted to ask, if the site already uses Wordpress, can you still have it installed in there for a blog?

The site is one of those tall sites that doesn't have other pages other than the blog.

This should be cool.
 
I have read all the replies. Are subdomains really not given any boost? A while ago I thought I read about people buying authoritative domains and making a bunch of subdomains to point them to other sites, didn't I?

I will make it in its own folder.

The other thing I wanted to ask, if the site already uses Wordpress, can you still have it installed in there for a blog?

The site is one of those tall sites that doesn't have other pages other than the blog.

This should be cool.

Overall it's safer to use /blog; it avoids the risk of having Google treat your blog as a new site.

Looks like you have Wordpress installed, and want your posts to be on a separate page? In Wordpress, be sure to select a static front page and a posts page in Settings > Reading
 
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