China is very censored and extensively strict when it comes to internet.
All popular sites in the world have been blocked in China.
The reason behind censorship in China because of China policy against sensitive co tents such as China history,protest and data.
In China all google service such as gmail,drive,google search etc have been blocked included social media like Facebook, WhatsApp twitter,Instagram, youtube, vpn and other sites was blocked too.
Any site or app that collects data,shares photo or video is severely banned in China.
Greatfire.org use this site to check all blocked websites in China .
List of websites blocked in China
Google was blocked in China because google refused to filter search results to China government.
Later on all google service was totally blocked in china.
Facebook was blocked in China because they collect data and share photos.
Collecting of data and sharing of photos is against China policy.
All blogging platforms such as blogger,blogspot,WordPress six etc became inaccessible because it was considered to be harmful.
WhatsApp was banned because of information they such such as sharing photos.
New York Times
Wall Street Journal
China prefers local firm over foreign companies.