Social media is a powerful marketing tool, but most posts fade quickly – 92% of twitter retweets happen in the first hour, and Facebook posts receive the most comments in the first few hours, says social media expert Steve Rubel.

AdoTube released their Q4 2010 Format Index on video advertising. This information is based on the 65 to 90 million in-video ad impressions they serve per week and covers the products they offer for advertisers. So this is more of a snapshot of their service and users and not really an industry-wide report