David Ramos/Getty; Skye Gould/Business Insider Facebook shareholders with nearly $3 billion invested in the company are trying to topple Mark Zuckerberg as chairman and tear up the company's governance structure. Business Insider has spoken to six prominent shareholders who said there is an unprecedented level of unrest among Facebook's backers following a series of scandals. They are in open revolt about Zuckerberg's power base, which gives him the ability to swat away any shareholder proposal he disagrees with. One investor compared him to a robber baron, a derogatory term for 19th century America tycoons who accumulated enormous wealth. Facebook says its governance structure is "sound and effective" and splitting Zuckerberg's duties as chairman and CEO would cause "uncertainty, confusion, and inefficiency." Facebook investors boasting nearly $3 billion (£2.3 billion) in shares are making moves to topple Mark Zuckerberg as chairman and tear apart his power base at the company. Business Insider has spoken to six prominent shareholders who are growing increasingly restless about the way Facebook is run, and ever more vociferous in their demands for change.See the rest of the story at Business InsiderNOW WATCH: This conveyor belt can move in any directionSee Also:16 of the biggest leaders in Silicon Valley reveal the one thing they would tell their teenage selvesPeople are complaining that Facebook is ruining its products with an onslaught of relentless notificationsMark Zuckerberg asks Facebook users to donate to help migrant families: 'We need to end this policy right now'SEE ALSO: Mark Zuckerberg is acting like a man who can’t be fired — and the unique way his stock is structured could be why