G's Related searches - Any feedback?

I've been looking a bit into the related searches element into G's search results. For some searches, you see this at the bottom of the search results.



Questions:

1. Do any of your sites show up in the 'sources include' section
2. How to get a site to be displayed in the sources include section
3. Does this require some kind of RDF or microdata?

The only references I could find were these:

Guys, would appreciate if someone could give insights into this.

Hi,

I have similiar questions regarding Google related searches.
Did you manage to manipulate the results? I haven't had enough luck until now.