As consumers, we sometimes ignore advertising as much as we can. Other times, we can't get enough--such as when the best spots air during big events such as the Super Bowl, or now the 2012 London Olympics, which kick off in just a few days.

You may not be able to afford a prime-time ad spot in the middle of the Olympics, but you can always learn what other brands are doing well.

The first, second, and third spots--in terms of which official Olympic sponsors are stirring up the most social-media buzz--are filled by P&G, EDF Energy, and Samsung. I know this because social-video platform Unruly Media has created an interactive infographic that measures which spots are getting the most shares on social networks.