For a long time, the "popular posts" block -- normally set to a week's span -- has been stable. There are steady risers and steady droppers, with one or more predictable meteoric rises (the reviews), plus the posts of mainstream interest.
But recently, I've been seeing strange behavior. Old posts resurrected, dethroning the long-time champions of the blog posts. The Isle Imperium posts rising, falling, then rising again.
What's going on? Is this the effect of GooglePlus?