Saw this infographic in the past but got reminded about it last week. It illustrates how much data is illustrated and added to the internet by some of the main social networking sites on the internet. I know there are probably other sites you know of that are missing. I remember seeing one on just Strava last year. If you know of more link to them in the comments or email me and I will add them. One that I would like an estimate on is how much data is generated and saved to memory cards from digital cameras every minute. Almost impossible to measure but I am sure it would be massive.