According to facebook:
We determine whether something is a top story based on lots of factors, including your relationship to the person who posted the story, how many comments and likes it got, what type of story it is, etc. For example, a friend’s status update that might not normally be a top story may become a top story after many other friends comment on it.
So, what was once top news, is now a top story and if you don't want it as a top story...
WHAT DO YOU DO?
Unmark it as a top story.
If you see some... read more