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

• the debster might not have any friends defined. If you are the debster, you can edit your LiveJournal friends so they show up here.
• the debster 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.
• the debster 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.