The dark side of tech: why the Guardian asks tough questions about Silicon Valley

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When Mark Zuckerberg testified before Congress in October, the Facebook founder and chief executive faced pointed questions about his decision to exempt politicians from a policy barring advertisers from promoting false claims - or to put it another way, his decision to allow politicians to spend money to promote lies.

"This isn't about helping the politicians," he told congresswoman Rashida Tlaib. "This is about making sure that people can see for themselves what politicians are saying."