Advocacy groups say activists in mainland China are being threatened or detained for posting messages of support or retweeting news stories
Chen Siming, a 58-year-old Chinese activist, has followed the protests in Hong Kong from afar, feeling inspired but also helpless.
From across the border in the southern province of Hunan, Chen does what he can to support the thousands calling for greater democracy in Hong Kong. In late August, he and more than 20 others posted online selfies of themselves covering their right eye, a gesture of solidarity for a young Hong Kong woman who says she was badly injured during a clash between police and protesters.
The complete withdrawal of the proposed extradition bill