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For example, blog.example.com hosts a blog which has an RSS feed on it, and is accessible by clicking on the Blog link on www.example.com. Sometimes Google will list www.example.com as the blog URL instead of the URL it's actually hosted on. This is especially true if your RSS code identifies www.example.com in the "link" tag of the channel, or even the items.
If you don't have anything that even resembles a feed, I don't know what the answer would be.
I've seen Google identify anything with an RSS feed attached to it as a blog.
I just checked and my site (again, definitely not a blog) has two feeds - one for the main site and one for the blog. I managed to find a page from the main site (i.e. example.com/mypage) on Google blog search, but the green url at the bottom pointed to the actual blog (i.e. example.com/blog), but the title in it was that of the feed for the main site.
Google is evidently confused.
I wonder whether I should have an RSS feed for this site. If it confuses Google about the nature of the site, it might be harmful.
I also have a few sites with RSS feeds, they're hand coded and they're not blogs, although people can comment on some of the content, I like the extra traffic, but it worries me a bit.
Anyway what's the definition of a blog? Using one of the major platform such as Wordpress? Writing about your cats?
Of course it is not enough: news sites use reverse chronological order, and many allow comments. I would say a blog also needs to be someone's personal voice - i.e. opinion based with a single author, strongly controlled by a single editor.
The important distinction is not blog vs website but good content vs poor content regardless of site architecture. I have also observed trends that suggest websites can benefit by providing rss feeds to key services.
HOWEVER, if your CMS has an active comments section I STRONGLY recommend you make visitors register and show comments only to logged in visitors. There is good reason that Google blog search returns blogs with protected comment sections (or no comment sections at all) so highly.
Better yet, add a traditional forum to your blog and consolidate user generated content while keeping your articles clean.