same applies on counting human photos on social site altogether (flickr, facebook, tweetpic, etc.) would be far more than 6,819,100,000 (population of the world - http://en.wikipedia.org/wiki/World_population)
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http://en.wikipedia.org/wiki/World_population <- Anyone know the reason for the UN's low and medium estimates having serious downturns in population in the next century? Is it because of lowering child-birth rates, or because of expectations of resources/diseases, etc...?
According to the PDF: http://www.un.org/esa/population/publications/longrange2/Wor... it's virtually all due to changes in fertility.
As countries grow in wealth and life expectancy, the number of children per woman tends to drop off drastically.
It's due to zombie apocalypse. Duh.
Keep in mind that every picture on that site is hand-made. The instructions disallow photos of actual giraffes or images created on/by a computer.
How many drawings and human-shaped sculpture are there on those social sites? I doubt there's more than the 6.8 billion you quote from wikipedia.