This post may mean NOTHING to many of you. Ignore it and move to your next favorite blog to read. I'm putting the information HERE on my blog, which feeds into my facebook account, because the facebook powers have been REMOVING posts about this issue. http://myhomeschool101.blogspot.com/2011/02/facebook-issues-cant-see-your-friends.html
They've made changes to facebook so that the default of your account is set so you can only view the people you've interacted with the few weeks before they made the change. You have to SELECT to see all your friends, groups, etc. in your feeds.
Scroll down your homepage (where all the "feeds" are). At the bottom on the right side is EDIT OPTIONS.
Once you click this you can SHOW POSTS FROM :
1 - FRIENDS AND PEOPLE YOU INTERACT WITH MOST
2 - ALL FRIENDS AND PAGES
Select ALL FRIENDS if you want that option -- it's not the default option, so you have to select it.
So, if you've been missing posts from friends tell them this information.
WARNING : all my original posts about this on FB were deleted within 8 hrs as were all my friends posts that shared this. Which is why I'm posting this outside FB.