Angry Birds may be the cause of $1.5 billion in productivity loss21
We've all seen statistics about how much productivity is lost because people use Facebook at work, or do other personal things. But, the story that rarely makes the rounds is that these breaks usually make people more productive, not less. Anyone who expects a human to work straight through an 8 hour day without breaks has no concept of how concentration works. People need small breaks throughout the day to reset their willpower and concentration, and these micro-breaks of checking Facebook or playing Angry Birds offers just that. So, Angry Birds may be a crazy time suck, but those few minutes usually lead to far better quality of work, and no real loss of productivity.
source: The Atlantic