For the past six-months, Google has been working on an algorithm to promote authorities on topics.
In short, Google is going to try to figure out which authors or individuals are authorities on a specific topic and promote their content across any site, in some way. You can read more about it in the links above.
This morning, I spotted a thread at Black Hat World where “black hats” are seeking ways to exploit this algorithm by “faking” author authority.
This is how one explained it:
Another added:
I doubt, seriously doubt, it will be that easy. But hey, someone has to keep Google on their toes.
Forum discussion at Black Hat World.