If content is king then metadata is its herald.
The first two decades of the internet has been about developing content to attract traffic, then adding social elements to make a “social web” where friends and strangers advise you on where to find the content you need.
Today what we realize is that content that is not found by the appropriate audience is not useful to either the organization that produced the content or the user that never discovers it. After all, how good your content is won’t matter if the intended user never sees it!
Q: And how do users find content today? A: Either via search engines or, increasingly, via the social web as well, or a combination thereof.
Tried and True Traditional Search Still Does the Job… mostly