There are a few reasons why you might not see posts on this friends page:
yigal_s might have no friends defined. If you are yigal_s, you can edit your LiveJournal friends so they show up here.
yigal_s 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.
yigal_s 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.