There are a few reasons why you might not see posts on this friends page:

• shades of grey might not have any friends defined. If you are shades of grey, you can edit your Blurty friends so they show up here.
• shades of grey might have friends defined, but all of their friend's posts might be over two weeks old (according to the times on our servers), and thus wouldn't be displayed here.
• shades of grey might have friends defined that post only protected entries that you can't view, because they haven't defined you as a friend in return.