Wieden+Kennedy have released a nice video case study of their recent Old Spice social media campaign, calling it

the fastest-growing and most popular interactive campaign in history

Some of the things they highlight are:

  • More people watched its videos in 24 hours than those who watched Obama's presidential victory speech
  • Total video views reached 40 million in a week.
  • Campaign impressions: 1.4 billion.
  • Since the campaign launched, Old Spice Bodywash sales are up 27%; in the last three months up 55%; and in the last month up 107%