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

• your friendly skidge might have no friends defined. If you are your friendly skidge, you can edit your InsaneJournal friends so they show up here.
• your friendly skidge 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.
• your friendly skidge 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.