Articles not showing in "More Articles" section

Hi there,
On Social theme, on homepage, there is middle column that should show "More Articles". Well this doesn't work in my example. I have 3 articles in blog and only first is shown, and there are links udner it for other two. But column with "More Articles" is empty. Do I need to do something? Add 'featured' as tag in articles? Or anything similar to see my articles, with thumbnail, as on your example in this section. Thanks a lot.

Regards
Dean