The home page on Facebook that displays status updates and content from within a user’s network. This is the first page users' see when they log in to Facebook. Newsfeed shows the most popular content from within a member's network by default, unless the user chooses to sort the Newsfeed by most recent content.
Why do you need to know about Newsfeed?
If you are using a Facebook Page to market your business, your posts may appear in the Newsfeeds of your fans. You might choose to promote your posts by paying a fee to Facebook to increase the number of fan Newsfeeds in which they will appear.