What's blocked on Weibo, China's popular social media site

Weiboa Chinese social media sitehas more than 600 million users and a slew of banned words.

There are about 160 words you cant search for and some that seem to change daily.

Jason Q. Ng, a Google Policy Fellow at the University of Toronto's Citizen Lab, published a book called Blocked on Weibo to explain some of the bans.

"Words that are calling for people to gather are certainly a red flag in online speech," Ng told Day 6s Brent Bambury. "So those are the types of things that would trigger either the censors or internet police to scrutinize your post more carefully."

Listen to the full interviewhereor by clicking on the icon above.