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Making his first UK appearance earlier this month via Skype at the Observer Ideas festival 2014 at the Barbican in central London, NSA whistleblower Edward Snowden argues that we should avoid companies who fail to safeguard our privacy; that technology could protect us from mass surveillance; and that he shouldn't be considered a heroThe Observer Ideas festival was part of Guardian Live, our series of events, debates, interviews and festivals exclusively for Guardian members. Find out about future Guardian Live events here