Armenia declared its independence from the Soviet Union.
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Chris Messina Tweeted #barcamp, which became the first use of a hashtag on Twitter.
The first-ever photograph was taken of the Earth from the surface of the Moon.
Nicki Minaj's Super Freaky Girl debuted at number one on Billboard's Hot 100.
Mars had a 'close encounter' with Earth at 34.8 million miles apart.
During World War I, Japan officially declared war on Germany.
