Chinese authorities deleted numerous blog posts, closed down individual blog accounts, and blocked a whole cohort of words and phrases, such as "that year", "massacre", "recall", "candle", "suppress", "mourn" "square" and "today", from the Chinese equivalent of Twitter - Sina Weibo, as many commemorated the 23rd anniversary of the Tiananmen Square massacre of 1989.
See here.
In an inexplicable coincidence, the Shangai equivelent of the FTSE 100 - Shanghai Composite Index of shares - closed 64.89 points lower by the end of Monday's session. According to reports, as the infamous string of digits 6, 4, 89 appeared, many began to tweet the phrase "even the Shanghai stock market weeps at the memory".
The Chinese authorities responded by adding "Shanghai Composite Index" and "Shanghai stock market" to the list of taboo words.