This article originally appeared on ABACUS If you’ve ever sent out a tweet, there’s a chance your thoughts about a certain president (or, say, bananas) are sitting on a server somewhere belonging to the US Library of Congress. Now China has similar plans for Weibo posts, and some people are worried. The National Library of China says it will start archiving all public Weibo posts as part of a government initiative to preserve digital information. The library said that Weibo’s operator Sina contacted them last year about donating all the data of its public pages, including more than 200 billion user posts and 500 billion comments and likes on the Weibo platform. The archive will also include more than 210 million news stories and 1.3 billion pictures from Sina’s main site. Weibo maker Sina is one of China’s oldest web portals The data will be stored on Sina’s servers and analyzed jointly by Sina and the National Library, the library said . It added that the information collected is for non-profit purposes such as policy making and academic research. These non-profit uses have not assuaged fears of Weibo users who, not surprisingly, have concerns about privacy. “Saying it’s for research and that’s it?” reads the most liked comment to a Weibo post about the project. “It’s just 'expropriated' like this?” “Are you serious????” another user said in a popular comment. “We didn’t agree to this.” Twitter users also had privacy concerns when the US Library of Congress started archiving public tweets in 2010. The library gave up this effort at the beginning of 2018, by which point archiving billions of tweets per week proved too much. It's not clear how the National Library of China will deal with all this data, but Weibo users aren't likely to have any say in the matter. Weibo states in its terms of service that the platform reserves the right to use content posted by users, so the company technically doesn’t need user approval. But users still have other reasons for finding the move unsettling. Chinese censors keep a close eye on what’s happening on social media platforms and have punished people for the content of their posts. By law, the author of a libelous post shared more than 500 times or viewed more than 5,000 times could face up to three years in prison . Penalties can even cover things shared in private chats. One person arrested in 2017 was locked in a cell for five days because he shared an off-color joke about rumors of a senior government official’s love triangle in a WeChat group. There are many similar incidents. One WeChat user was sentenced to 22 months in jail in 2017 after he made jokes about Chinese President Xi Jinping. He was convicted of “picking quarrels and provoking trouble,” a wide-ranging law often used in cases involving forms of expression. That same year, the government starting holding WeChat group administrators legally liable for things that happened in their groups. The long-held fear among Chinese people of being punished for what they express has made them concerned that Sina might be adding yet another surveillance tool for the government. “Is this for seeking retribution afterwards?” a Weibo user asked in a comment that received hundreds of likes and echoed the sentiments of many similar posts. Others are wondering how exactly the national library will go about archiving everything, including what they will do about censored Weibo posts. “Maybe posts that are blocked or censored are more worthy of preservation,” one Weibo blogger said. For more insights into China tech, sign up for our tech newsletters , subscribe to our Inside China Tech podcast , and download the comprehensive 2019 China Internet Report . Also roam China Tech City , an award-winning interactive digital map at our sister site Abacus .