We've reposted infographics on steps you can take to improve your Facebook EdgeRank but you may not fully comprehend what it is.
From VA Simple Services: The average Facebook user has around 130 friends and is connected to approximately 80 community pages, groups and events. Most users would be overwhelmed to see all of the activity generated by these connections. To avoid this, Facebook use an algorithm formula called EdgeRank to decide what users will see in their newsfeed. This formula is based on 3 elements: Affinity, Weight and Time Decay.
Here's a simple infographic that helps you understand the elements of EdgeRank. Understanding the algorithm will help you to improve your visibility and engagement with your Facebook community.