Facebook is blocking all of your friends news feeds except for about 250 that they choose (not sure how that is determined).

Go to your HOME page. Make sure your feed shows LIVE FEED. Then scroll to the bottom of the page, click “Edit Options”, you will then see your LIVE FEED SETTINGS, called “News Feed Settings” (???). Change the 250 to 5000 for Facebook’s friend limit and your feed will work right again