[â€¦] when you submit a post with multiple categories, you are creating "duplicate content" which the search engines frown upon.
For example: Let’s use your post "What you can learn from the FT," you have it in your Business, Communication, Mainstream Media, Online Media, Trends categories.
Even though it is the same words on the page, the search engines look at it as duplicate content, and penalize for it. The severity of the penalty is hotly debated, but never the less, you are penalized.
Solution is to only post to your blog with one category, not several.
I’ve had discussions before over the years re duplicate content on a site, usually referencing cross-posting, ie, duplicating the same content on different sites. I don’t do that with one large-ish exception: the podcast I co-present twice weekly gets posted on the podcast blog and on mine as well as my co-presenter’s. So that’s three places, twice a week.
Then there’s content syndication where some of my content is re-published with my permission by people like WebProNews, BlogBurst and Newstex. (We won’t mention content scrapers who steal your content and post it, too, thus increasing the duplication of your content.)
Now all of that relates to content being duplicated elsewhere, whereas what you’re talking about is the same content on a single site but appearing under multiple categories.
Some people say the differentiation doesn’t matter, it’s all a problem for the blogger with search engines notably Google. Others have entirely different views, saying multiple category assignment is no issue at all.
My own view is that I assign categories to posts that I think will make it easier for people to find that content when they search for it. I see this as common practice even among highly influential blogs. You see the same situation with multiple tags, a slightly different animal than categories.
I’ve yet to see a clearly definitive statement by someone I trust and see others paying attention to that says, categorically, that posting in multiple categories is a fast track to hell!
Thereâ€™s certainly no consistent opinion that I can find, one way or the other. The closest post I could find is one from March 2007 by Darren Rowse that addresses posting in multiple places rather than posting in multiple categories in the same place.
Incidentally, I find it a bit ironic that, try as I might, I couldnâ€™t think of more than just one category under which to file this post.
So what do you think? Is posting in multiple categories a bad thing?