Sheryl Sandberg says she faced sexual harassment and firms lack clear policies

• Facebook executive warns: 'I have already heard rumblings of a backlash'
• Abuse of power is common feature of workplace harassment, Sandberg says

Facebook executive Sheryl Sandberg has warned of a potential backlash against women amid the continuing spate of sexual misconduct charges against prominent men, and urged companies to put into place clear policies on how such allegations are handled.

In a Facebook post, Sandberg wrote: "The 1992 presidential race was once summed up in a pointed phrase: 'It's the economy, stupid.'