Using Google+ face tracking. We had to convince agency creatives to include Google+ ideas in their campaigns. But first, we had to let them sample it for themselves. So we challenged agencies to compete head-to-head in a nationwide Ping-Pong tournament. In a Google Hangout.

42,000+ people played in 11 countries. 50% left with shattered egos. 50% left with even more swagger. 100% now see what a great channel Google+ is.