Is Yahoo Burning Tumblr's Books?

When Yahoo acquired Tumblr in May for more than $1 billion, there was more than sufficient outcry: Some users fled, others criticized the deal, likening Yahoo to a "mom trying to be hip." The message from Yahoo CEO Marissa Mayer was that she wouldn't "screw it up." But based on what's happened since, it seems like she's done just that--and the folks in the print-book publishing industry who, for the last six years, have relied on Tumblr blogs to produce a steady stream of readily marketable content, could feel the effect.