What does "knowledge nugget" mean?

Nugget has multiple senses that include

(countable) A small, compact chunk or clump. (eg) a gold nugget
(countable) A tidbit of something valuable. (eg) a nugget of wisdom

As a consequence, one can argue either way regarding implication of value. Of course, your example, knowledge nugget is closely analogous to "a nugget of wisdom" (an example from wiktionary). The definition offered in a link in a previous comment, that "A knowledge nugget is a small item or piece of useful knowledge in categories of interest to the user", also implies value.

I don't think that nugget implies value. Gold nuggets are only valuable because they are gold. Chicken nuggets on the other hand, well, I wouldn't call them valuable.

A knowledge nugget implies that the information is small and self contained. That is what nugget implies to me. A nugget of knowledge wouldn't need any more explaining to be understood, and it wouldn't take long to understand.

In reply to FumbleFingers: Certainly in its origin of the gold rush in America, nugget meant something valuable. However these days you can have a nugget of dung, shit, hate, and even nuggets of bile and pain, so I doubt that all nuggets are valuable. I maintain that a nugget's worth is based on what it is a nugget of, not that it is a nugget.