Hundreds of Facebook employees are asking the company to change its policies on political ads, according to an internal letter obtained by The New York Times.

The social network currently refuses to fact-check ads from politicians, allowing them to lie with impunity.

250 employees signed on to an internal open letter calling for this to end and for Facebook to make a series of other changes.

Facebook's polices on political ads are proving intensely controversial, in particular with Democrats.

On Monday, The New York Times' Mike Isaac reported that more than 250 workers at the Silicon Valley social networking giant have signed an internal letter calling on the company's leadership to change course on its stance on political ads, which has become the latest political firestorm to engulf the company.

"Free speech and paid speech are not the same thing," the letter reads, according to a copy of it published by the NYT.

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