Two women and a man are held for posting "false information," though flood victims say the government should have evacuated them.
Former contract teachers across China have been fighting for decades for the government to implement promised pay and benefits.
The move sparks further criticism over a lack of respect for Yanhuang Chunqiu 's charter.
The move is part of a nationwide crackdown on any online content not officially approved by Beijing.
Guo Feixiong is subject to constant verbal abuse and sleep deprivation by cell-mates, activists say.
Lu Yuyu and Li Tingyu have been formally arrested on public order charges, rights groups and lawyers say.
Thousands of villagers continue to protest amid an information blackout by local authorities.
Activists had hoped to highlight grievances such as land grabs at the summit venue, but are now under round-the-clock surveillance.
Joshua Wong and two other former leaders of the 2014 Occupy Central pro-democracy movement vow to continue to 'fight for their rights.'
An overseas rights group says Guo Feixiong should be given proper medical attention after refusing food and water for more than two months.
The family of detained dissident Zhao Changqing had faced continual harassment from the authorities back home.
Analysts say the government wants to avoid a rerun of anti-Japanese protests in 2012 over disputed islands in the East China Sea.
Members of a large house church are warned to stop their "illegal gatherings," while a cross is torn down from its wall.
Former publisher Du Daozheng says the editorial team may still be able to run seminars and publish 'some things' online, however.
Some warn of a 'backlash' if officials try to weed out candidates unacceptable to Beijing.
Ethnic Mongolian herding communities say they will have no livelihoods once their land is drowned by the reservoir.
Pan-democratic lawmakers say the move is yet another assault on free speech in the city.