Death, taxes and Facebook changes. They come to us all.
The news feed now places an emphasis on "top stories" instead of recent posts. So users who don't regularly visit the site will only see these top stories, which are based on your relationship to the person who posted, the type of story posted and the number of comments and likes received. Frequent visitors will see an option to expand recent posts at the top of the page. Top stories are marked with a little blue triangle in the top-left corner of each post.
To make up for the lack of a proper timeline in Facebook's main news feed, a "news ticker" now appears on the top-right corner of the screen, showing friends' latest updates in chronological order. Clicking on these updates shows the full story and all related likes and comments.