Have you noticed recently that most of the wall posts on your news feed are only from a small portion of your friends?

Have you been blocked? Or deleted? No.

Well, basically, facebook came up with the option of self-selecting only updates of friends whom you have interacted with recently... to be placed on your news feed...

A quick fix will be to scroll down to the end of your news feed and click "edit options" and change it as shown below ^^x