Suppose you have a company Facebook profile that has 10,000 fans. Your posts are being viewed by only 100 of those fans on average. You know that more than 1% of your fans are logging on to Facebook every day. What explains this low viewing by your fans?
Answer: Facebook does not display all content posted by friends or liked pages. Each user has hundreds of friends, so it would be too much. Use algorithm formerly known as EdgeRank, to put certain posts on your wall.
-It has low engagement, viewers are not engaged. The Facebook algorithm notices that and stops displaying it