I have a wordpress 2.3 blog and noticed the tag feature. Putting tags into my posts, and clicking them tags look like categories... while the post is listed in a category and the tags, is this duplicate content? I have not used tag in fear of this. Do you recommend using tags? Thanks.
If you are really worried about it, you can use robots.txt to block Google from crawling your categories or tags paths. However, Matt Cutts wrote an article about this, and here's what he said: Here's the whole article. I block the "categories" paths in robots.txt, but it sounds like as long as the articles are on your domain and you don't have a spammy site, it's not a big deal. It's not hard to block them just in case, so I do.
its ok to use tags and categories at the same time as they are indexing methods not duplicate methods.
try this for your Wordpress site's robots.txt: on top of that, install all in one SEO for Wordpress and it will take care of the tags/categories duplicate content issue.
Say your domain is abc.com. It blocks every folder/file that begins after your website from being indexed in google. Eg. it blocks: abc.com/cgi-bin abc.com/wp-admin abc.com/wp-includes abc.com/wp-content/plugins
Yes, 2.3 comes with 3 taxonomies - categories, tags, date-based archives. Having all 3 creates duplicate content. Choose one, and only one. Then in your theme *remove* all references to the other 2. If you're a tag kind of person that's fine, just get rid of the other two. Me... I use categories. That is a personal preference, not a case of better/worse.