Facebook has promised to explore restrictions on live-streaming, two weeks after it was used during gun attacks on two mosques in New Zealand.
Chief operating officer Sheryl Sandberg said the social media giant agreed with calls it “must do more”.
Fifty people were killed in the Christchurch shootings, and the original video of the attack was viewed 4,000 times before it was removed.
Meanwhile, New Zealand is to review “inadequate” laws on hate speech.
Justice Minister Andrew Little said the current laws did not tackle “the evil and hateful things that we’re seeing online”, and that the government and the Human Rights Commission would work to bring forward proposals by the end of the year.
More than 20,000 people attended a memorial service in Christchurch on Friday to honour the 50 victims of the 15 March shooting.
Of the dozens injured, 21 people remain in hospital, three of them in intensive care.