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