The thing that annoys me most about it is the "kudos" thing that animates on mouse-over. I've accidentally "given" kudos a couple of times before I figured out what it was so I could avoid it.
It is pretty sweet on mobile. On the desktop it offends my sensibilities as much as, say, using HTTP GET to affect state.
what if the mouse-over triggered a POST?
Wow, yes, that is awful... it's not even completely clear after you've triggered it that giving 'kudos' is what you've done.