Facebook will add 3000 staff over the next year to monitor reports of inappropriate material on the social media network and remove videos such as murders and suicides, Chief Executive Officer Mark Zuckerberg says.

Mr Zuckerberg’s announcement in a Facebook post on Wednesday US time came shortly before the company’s share’s dipped from a record high amid warnings that the company’s advertising revenue growth would likely come down.

Mr Zuckerberg said the new workers will be in addition to the 4500 people who already review posts that may violate its terms of service.

The hiring spree represents an acknowledgement by Facebook that, at least for now, it needs more than automated software to improve monitoring of broadcasts on Facebook Live, a service that has been marred since its launch last year by instances of people streaming violence.

Last week, a father in Thailand broadcast himself killing his daughter on Facebook Live, police said.

After more than a day, and 370,000 views, Facebook removed the video. Other videos from places such as Chicago and Cleveland have also shocked viewers with their violence.

Zuckerberg said: “We’re working to make these videos easier to report so we can take the right action sooner – whether that’s responding quickly when someone needs help or taking a post down.”

Advertising warning

The warning of an impending drop in advertising appeared to outweigh Facebook’s surging quarterly profit and revenue, fuelled by growth in its mobile ad business, which is still not showing much sign of slowing down as the company nears the five-year anniversary of its initial public offering.

Facebook said quarterly profit rose 76.6 per cent year-over year to $US3.06 billion ($A4.12 billion) and total revenue went up 49 per cent to $US8.03 billion.

Mr Zuckerberg said in a statement it was a “good start to 2017”, but Facebook’s shares fell 2.7 per cent in after-hours trading to $US147.60 ($A198.73).

They had closed at a record high of $US153.60 ($A206.80) on Tuesday.