Mark Zuckerberg came under fresh pressure after four US officials called for a boardroom shakeup at Facebook.

Three state treasurers and a top official from New York have joined a shareholders’ motion to install an independent chairman at Facebook, claiming the move would improve governance and accountability.

They have endorsed an ongoing campaign to oust Mr Zuckerberg from his dual role as chair and chief executive just weeks after his company was engulfed in the biggest data breach to ever hit a social media company.

In June, Boston-based Trillium Asset Management, which holds $11m in Facebook shares, launched an effort to split the role of chairman and chief executive at Facebook following scandals over the hacking of personal data from millions of users and claims of hate speech and election-rigging.

The motion has now received additional support from Illinois state treasurer Michael Frerichs, Rhode Island state treasurer Seth Magaziner, Pennsylvania treasurer Joe Torsella, and New York City comptroller Scott Stringer.