Facebook announced today that they will be changing the way they serve up posts that link to outside sites. Click Baiting, as the practice is called, is when a post is made with little information. Think of posts that you see that say "Click Here To See More". Facebook is now going to measure the time that a user clicks on a link and then returns back to use Facebook. They are going to make certain assumptions. They will assume that if you click a link and then immediately come back to Facebook that you did not find the content valuable.
Many sites are using time spent as a metric for content performance. It is understood that if a visitor spends time on your site that you are serving up good content. If they are not spending any extended time, it is assumed that you are not.
To read more about the new change: Click Here