What are the difference of Related or Recommended content for the "More Content" widget?

As I look at the More Content widget I see the two different Type options as "Related" or "Recommended"...

What is the algorithm that is being used for each of these to determine what to display?

At the bottom of our default wiki layout, I noticed both were there and am wondering how Telligent is determining what content should appear as Related, Recommended, or Recommended People.

If someone could outline the differences in these and how they are selecting content/people, that would be really helpful.

Here's an example of what's showing at the bottom of one of our wiki guide articles...