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

• feed yourself might not have any friends defined. If you are feed yourself, you can edit your Blurty friends so they show up here.
• feed yourself 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.
• feed yourself 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.