I've been immersing myself in the world of AM for the last few weeks, and I'm learning a lot. But I've noticed that a lot of the content out there is from earlier years and that there aren't as many posts about the industry today. Can anyone shed some light on what the industry is like nowadays and the differences between now and say 2009? Specifically, what's going on with PPC and is the advice from 2009 about PPC still relevant in today's environment?