Sgt_Kickaxe - 5:28 am on Jun 7, 2013 (gmt 0)
Silly? I'd wager it's an attempt by Google to have people get used to setting aside their privacy concerns. Google's invested extremely heavily into things like Glass, Maps and anything that gathers your most personal details. Getting you to make various faces which Google records has other applications, like helping drones recognize you etc.
I'd like to see a new Google idea that doesn't involve personal information being shared with them, it's been a long while.