I just noticed that I see only the status messages, links and photos from friends whom I know them personally in Facebook. I did not realize that it is the default set by Facebook until I read a note shared by my friend in Facebook. What Facebook does is that News Feed on your facebook account only shows the updates from your friends whom you’re interacted most. It means that you don’t see any other updates from some of your contacts you never interacted.
To change this feature, scroll down to bottom of Facebook until you see “Edit Options” link. Click on it and you will see “Edit Your News Feed Settings” dialog box. Select “Show posts from” menu and change it as your personal choice.