Wow. If you have anything to do with measuring the success of your Facebook page, or if you've ever wondered how many of your fans actually see your Facebook posts, then you have to look at Emeric Ernoult's post on the Convince and Convert blog. Although it's called "Busting Facebook’s Most Widespread Myth," it's really a primer on the complex world of Facebook reach metrics. Here's a sample:
...pages in the range of 100,000 fans have an average fan reach of 6.7%. However, the average of the worst 5% performing pages shows a reach of 0.6% of fans (oops!), while the top 5% performing pages reach an average of 20% of their fans with each post.
There's a whole lot more. Go read the post. --WTP (thanks to Entrepreneur for the image)