Publishers are blaming dramatic drop-offs in Facebook traffic to their auto-sharing Timeline news reader apps on a change by Facebook in how stories show up in news feeds. We’ve heard this one before – social games were probably the first victim of Facebook’s often-random changes in thinking on cross-promotions and ranking algorithms. Facebook more or less made it up to the social games, but then they share 30 percent of digital goods sales with Facebook. Different publishers have different ad strategies for their apps, but Facebook is rarely involved. As my GigaOM colleague Mathew Ingram points out, even with the drop-off a lot of those apps have pretty big numbers. Regardless, surely Facebook apps must be a better traffic strategy than slideshows.