🧵Secret watermarks now enable China to identify netizens who post screenshots from Douban and Zhihu. "Following Douban (豆瓣), Zhihu (知乎) has added b

🧵Secret watermarks now enable China to identify netizens who post screenshots from Douban and Zhihu. "Following Douban (豆瓣), Zhihu (知乎) has added b