Facebook was initially designed to function like an interactive online yearbook. You start by creating a free personal profile that includes a photo and some biographical information. Next, you can search for people you know and send them friend requests. Once accepted, your friends can see your profile and updates and you can see theirs.
These status updates make up a running stream of content. When you view your home page on Facebook, you will see a news feed of the status updates from those you are connected to. In addition to brief text-based message, users can share photos, videos and links. It’s a bit like being a voyeur into the lives of those you’re connected to. You also have the opportunity to comment back on a friend’s post and begin to engage in online conversation.
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Now, the Facebook "Algorithm" has changed that to the point where they only allow a few drops of people, let's say 100 out of 1,000 people, to see your post on your fan page. It has been long speculated that they did this to force page owners to pay in order to reach the rest of our fans.
This is even happening on people's regular profiles as well. The only difference is, you are still getting organic reach with your personal profile, it's just based on the level of engagement with the content you share with your friends and family and how many people are "interested" in that content.
Like Google, no one really understands "how" or "when" Facebook's algorithms are doing this. Most of the time it's very random...
