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If you wanted to learn more about Sina Weibo's censorship patterns, today is your lucky day. A group of computer scientists from Bowdoin College, Rice College, and the University of New Mexico have, along with an independent researcher, released the results of an academic study of Sina Weibo's censorship practices. The study, which we came across via MIT Technology Review, used "architecture [that could] detect post deletions within one minute of the deletion event," giving the researchers perhaps the most precise look yet into how quickly Sina's content team takes down sensitive Weibo posts. The results? Sina is pretty darn fast:

So Sina's censors are pretty fast. But what, exactly, are they deleting? Researchers used a variety of analytical tools to look at what content was most quickly deleted, and found that:

Researchers also found that, unsurprisingly, users with more total deleted posts tended to get their posts deleted more quickly than other users, suggesting that Sina's content team was watching their accounts more carefully. The following chart from the study shows the downward trend in post lifetime as a user's number of total deleted posts increases:

Of course, it's not all humans doing the deleting. In fact, by the study's estimations, for an all-human team to censor Weibo, 4,200 team members would be required, assuming each team member could read at the blazing rate of 50 posts per minute. The study points out that as a result of that, weibo's censorship system has become an incredibly complex system, employing both human and software censors, employing multiple blocked keyword lists that trigger different censorship responses, search filtration systems, and more. (Of course, none of that should come as much of a surprise to longtime weibo users, who have likely experienced many of the different types of censorship on Sina Weibo firsthand).

If you're really interested in Weibo censorship, the full paper is worth a read, and although it's a bit dry and quite technical in places, the good news is that it's only ten pages long.

(via MIT Technology Review)

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Censorship Alert! Academic Study Shows Sina Weibo's Human Censors Are Pretty Darn Fast

Censorship on Weibo, Chinas version of Twitter, is near real-time and relies on a workforce of over 4,000 censors who stop work during the evening news, according the first detailed analysis of censorship patterns.

The Chinese version of Twitter is a microblogging service called Weibo which launched in 2010. This allows users to post 140 character messages with @usernames and #hashtags, just like Twitter although 140 characters in Chinese contain significantly more information content than in English.

In just three years, Weibo has picked up some 300 million users who between them send 100 million messages each day at the rate of 70,000 per minute. That makes the inevitable process of censorship a tricky task for the Chinese authorities. So an interesting question is how they do it.

Today,Dan Wallach at Rice University in Houston, Texas, and a few pals reveal the results of a detailed study of censorship on Weibo. Their method has allowed them to reconstruct the censorship techniques used by the government, to calculate the number of workers who must be involved and even to discover their daily work schedules.

The work is possible because at least some of the content on Weibo is not censored prior to publication, only afterwards. Their approach was to collect posts from a set of users once every minute. They then tracked these posts to see which ones later became unavailable.

Of course, its not feasible to track everyone on Weibo so Wallach and co spent some time looking for users who seemed to have posts deleted more often than others, assuming that these users would be more likely to be censored in the future. Using this manual technique, they ended up observing some 3500 users over a period of 15 days last year who between them experienced around 4500 deletions per day, or about 12 per cent of the total.

Not all deletions are the result of censorship, however, since a user can delete his or her own posts. Wallach and co say that through their own trial and error they observed two types of deletion which return different messages. When users delete their own messages, a query for the post returns a post does not exist error message.

However, when a post is deleted by the censors, Weibo returns a different message saying: permission denied. It is these second type of deletions that Wallach and co concentrated on.

The results of their study are fascinating. They say that in their data set about 5 per cent of the deletions occur within 8 minutes of posting and around 30 per cent within 0 minutes. In total, 90 per cent of deletions occur within a day, although at times deletions can occur several days later.

See the rest here:
Computer Scientists Measure the Speed of Censorship On China's Twitter

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