Debate over anonymity and free speech after a prominent internet troll's identity is revealed.
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Residents use social media to coordinate blood donations and criticise politicians' response.
Opportunities for arms control and a nuclear-free age.
How did the candidates fare online?
The presidential candidate's defence of his record on gender equality backfires online.
How are campaigns using personal online data to win the presidential race?
Increasing use of unmanned weaponry raises legal and ethical questions.
Netizens judge Biden and Ryan on social media.