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7 Billion World [7billionworld.com] displays 7 billion people together on a single webpage.

Developed by Worldometers - which themselves were originally posted in the good year of 2005 -, the web page itself is generated through some small programming code, yet is claimed to be 1 mile (1.6km) high and 800 feet (250m) wide, which is both horizontally and vertically scrollable.

Reminds me of World Population One.