Thursday marks the 26th anniversary of the Tiananmen Square crackdown, and China's government censors are hard at work stamping out any mentions.
Money transfers made through Tencent's popular messaging app WeChat are even being blocked -- if they're made in amounts with the numbers "64" or "89." The numbers are references to the actual date -- June 4, 1989 -- when soldiers and tanks rolled into Beijing's Tiananmen Square to disperse pro-democracy demonstrators.