Dustin Moskovitz, a billionaire Facebook co-founder, is pledging $20 million to defeat Republican presidential nominee Donald Trump Donald John TrumpBubba Wallace to be driver of Michael Jordan, Denny Hamlin NASCAR team Graham: GOP will confirm Trump's Supreme Court nominee before the election Southwest Airlines, unions call for six-month extension of government aid MORE.

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In a Thursday evening post on Medium, Moskovitz said he and his wife, Cari Tuna, are will be donating the money to super-PACs and Democratic committees dedicated to electing Hillary Clinton Hillary Diane Rodham ClintonJoe Biden looks to expand election battleground into Trump country Biden leads Trump by 12 points among Catholic voters: poll The Hill's Campaign Report: Biden goes on offense MORE.

“Like many Democratic voters, we don’t support every plank of the platform, but it is clear that if Secretary Clinton wins the election, America will advance much further toward the world we hope to see,” Moskovitz wrote.

He added: “If Donald Trump wins, the country will fall backward, and become more isolated from the global community.”

Prominent Silicon Valley voices have largely backed Hillary Clinton over Trump, though the large, wholly personal donation from Moskovitz risks inflaming accusations of liberal bias against Facebook.

In May, the world's leading social media network changed its handling of trending topics after reports earlier guidelines may have favored news stories from mainstream outlets.