People around the world have spent 9,305 years on YouTube since the site's inception. About a million videos were added to the site's 5.1 million during August alone. Those videos take up an estimated 45 terabytes of storage--about 5,000 computers' worth--and require several millions worth of bandwidth to transmit. 70% of YouTube's users are American, and roughly half are under 20. (Wall Street Journal 9/1/06)