The appeal of hiring someone who is actively involved with open source tech has less to do with heroic coding skills and more to do with identifying someone who is a curious, enthusiastic, and community-minded problem solver.
If you feel a swelling sense of pride every time you publish a mockup or do an a/b test you might be missing the point of MVP -- solving a problem without getting caught up in process.
The G+ feedback system is something special, and kudos to these guys for moving so fast... but... this is nowhere near as elegant and easy to understand. Less time making chubby little controls more time making it so you can mark up the actual page!