By default Facebook displays your wall postings in the News format, which means it only displays posts it believes are most relevant to you. These results are based on your past interaction with your friends. If you want to see every post made by all your friends that are not hidden click the Most recent link in the upper right section of your news feed as shown in the above picture example.
If you want to adjust who shows up manually click the Edit Options in the bottom right corner of your news feed.