No doubt the reason for this is that many bloggers aren’t sure which way to go which is why they keep asking.
Are you missing out if you don’t index content grouped together like this?
Should you index tags and no index categories or simply index categories and not tags?
This post is referring to category and tag archives.
Here’s an example of a:
Lets now take a look at what 2 of the experts have to say.
If you read this excellent guide, you’ll find the Thesis theme, by default, indexes category archives and no indexes tag archives.
On smaller sites it might make sense to noindex either the category or the tag structure, but in my experience noindexing those on yoast.com does little to no change at all. Source: Yoast
Personally, on this site, i use the default Thesis SEO settings which index categories. However, i do not use tags very much only on very specific related content which i do index.
How about you?