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Last Wednesday was the 25th anniversary of the 1989 Tiananmen Square crackdown. Despite massive protests, it wasn't news in China. June 4, the anniversary of the protests, is sometimes called "Internet Maintenance Day" in China because of all the temporary censorship the government imposes.
And if you were behind the Great Firewall on Wednesday you couldn't search for terms like June 4th or Tiananmen, according to the Wall Street Journal. Things like "campus upheaval," May 35 (which is of course, June 4), "between spring and summer", the Roman numerals for 1989, "student movement", "8 squared" (which is of course 64), "three days after June 1," "March 96” – the list goes on and on and on.