Paying to Promote Pages on Facebook: What's Changed?

Here are two great summaries of what's going on with Facebook Pages and the Sponsored (read paid) Posts options. If you're wondering why your reach on Facebook seems to be getting smaller, this will help you demystify the changes at Facebook.

From the New York Observer, Broken On Purpose: Why Getting it Wrong Pays More Than Getting It Right and from Dangerous Minds, Facebook: I want my friends back

(Thanks @sublimestitch for the resources).