Have you noticed that you are only seeing updates in your newsfeed from the same people lately? Have you also noticed that when you post things like status messages, photos and links, the same circle of people are commenting and everyone else seems to be ignoring you?
Don't worry, everyone still loves you and nobody has intentionally blocked you. The problem is that a large chunk of your friend/fan list can't see anything you post and here's why:
The "New Facebook" has a newsfeed setting that by default is automatically set to show ONLY posts from people who you've recently interacted with or interacted the most with (which would be limited to the couple of weeks just before people started switching to the new profile). So in other words, for both business and personal pages, unless your friends/fans commented on one of your posts within those few weeks or vice versa - you are now invisible to them and they are invisible to you!!
HERE'S THE FIX: Scroll down to the bottom of the newsfeed on the homepage and click on "Edit Options", click on "Show Posts From" and change the setting to "All Of Your Friends and Pages" Note: This is the fix for personal pages but I am unsure of whether or not the business pages are set up the same way.