You may have already heard from other authors like Kevin Hearne (1|2) or tycoons like Mark Cuban that changes are afoot at Facebook. (Slate featured an article on the topic, as well.) The quick and dirty version is that when we used to make a post on FB, everyone that liked our pages would get to see that post. Now, if sources near and far are to be believed, only 15% of my audience do. If I wish to reach the once usual 100%, I must pay, and pay a lot. There is some variability to this phenom...