Australia's leaders are preaching hope and peace while condemning the "swampland of hatred" created by right-wing extremists, including those in parliament.
Prime Minister Scott Morrison attended services for multiple faiths on the weekend, in the aftermath of the shooting spree at two New Zealand mosques.
An Australian man, Brenton Tarrant from Grafton in NSW, has been charged with murder over the mass shooting that has claimed the lives of 50 people.
Mr Morrison said it was important to send a message of hope.
"In the midst of this awful atrocity this is the hope we can cling to, peace-loving and free people all around the world," he told reporters at a Coptic church in Sydney on Sunday.
"We can all band together to stand against this hatred and this violence and we all stand together as people of many different faiths or no faith at all, standing together for innocence and for peace and for love over hate."
Opposition Leader Bill Shorten, who visited a Melbourne mosque, said it wasn't about religion but humanity.
"A nation can make a choice, it can respond to a shocking act of evil like this in one of two ways," he said afterwards.
"We can retreat back into our own tribes, we can retreat behind our own walls, our own faith, we can decide that we will just live our lives with greater fear, greater hate, greater suspicion of people who are different.
"Or we can make another choice: we can choose to confront fear with hope, to confront hate with love.
Both leaders turned on social media giants for not doing enough to ensure they could avoid Friday's situation where the shooting was broadcast live on Facebook and video of the event was widely shared.
"We will be seeking to get assurances from the social media companies about their capabilities to ensure that this tool cannot be used by terrorists," Mr Morrison said.
Mr Shorten said hate speech had been allowed to fester in the name of free speech and liberty.
"I say to those extreme right politicians in Australia, those keyboard warriors who hide behind the internet: you can't hide, you can't disown your stupidity, your ignorance, your foolishness, your hatred, your racism, your intolerance, your un-Australian attitude," he said.
"You, by your hate speech, have created a swampland of hatred through your ideology of hatred. You cannot disown what crawls out of your swamp."
New Zealand has promised its close relationship with Australia won't be shaken by Friday's events despite the shooter's origin.
"He does not represent Australia and he does not represent New Zealand. He is an individual, and that is how we see it," High Commissioner Annette King told reporters in Canberra.
"What you should judge our relationship by is what has happened after the event, and the relationship is strong."
Mr Morrison said Australia was sending New Zealand all the help it could, including medical assistance, help with the coronial process, and support between Muslim communities in the two nations.