Six years after leaking documents about the National Security Agency's mass surveillance activities, Edward Snowden believes the world is changing.

He recognizes that people are more aware of privacy problems and angrier about them than ever, but he still seems to want people to take more time to understand the specific "abuse" being committed against them.

Snowden hit out at big tech companies, saying they make populations vulnerable by collecting data and allowing it to be accessed by governments.

"These people are engaged in abuse, particularly when you look at Google and Amazon, Facebook and their business model," he said.

"And yet every bit of it, they argue, is legal.

He fled first to Hong Kong, and was later granted asylum in Russia, where he still resides.

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