Since President Xi took power in 2012, China has launched an unprecedented crackdown on online freedom.
Thirty years ago, Beijing's Tiananmen Square became a symbol of pro-democracy protests the world over as the site of several important events in Chinese history witnessed a deadly military crackdown. It crushed the protests led by students, eventually costing more than 10,000 lives.
The crackdown became one of the most censored topics on the Chinese internet. Around this time of the year, certain websites, including Wikipedia, Facebook, Twitter, YouTube and some Google services, are either fully blocked or temporarily “blacked out”.