Did you guys know the facebook default feed setting show 250 friends' feeds only? If you have more than 600 friends, if every 600 friends post something to their own wall, you can see 250 friends' post of wall only, you cannot see the other 350 friends' post of wall, you also cannot see the pages and groups post of wall. So, please change the setting number of feed to 700 or 10000.

Click "facebook" logo on top left there. Then "Most Recent View" on the top right there. Then click "Edit Options". Then type "1000" into "Number of Friends" field, then click "Save" button.