US based Zynga’s chief financial officer (CFO) David Wehner has left the troubled online gaming firm to join social networking firm Facebook.

Wehner will join Facebook as a vice-president of corporate finance and business planning, occupying the position that was vacant since August 2012, after John Schappert left.

Facebook said: "Dave’s deep expertise in finance, strategy and corporate development will be a great addition to our team."

As part of the changes in Zynga, Mark Vranesh, Zynga’s accounting executive, will replace Wehner as CFO, while Steven Chiang will manage all game development.

Zynga has also appointed David Ko as the new chief operations officer and Barry Cottle a chief revenue officer.

Zynga CEO and founder Mark Pincus said Mark, David, Barry and Steve are rooted in the firm’s culture, committed to its future and part of the talented bench of leadership at Zynga.

"I’m confident we have the right team to deliver on our mission of connecting the world through games and position us for long-term growth," Pincus said.

According to reports, Wehner’s leaving Zynga in less than a year following the firm’s initial public offering and after the departures of about eight other senior managers since August 2012 deteriorates confidence in the game maker’s efforts.