Singapore is bracing for reprisal attacks after the Christchurch mosque massacre, which left 50 worshippers dead earlier this month.
The country's defence minister, Ng Eng Hen, met with senior Australian ministers in Sydney on Friday to discuss co-operation on counter-terrorism.
"We again agree on the need for intelligence sharing both in anticipation of the returned fighters from Iraq and Syria as well as unfortunately the expected reprisals coming out of the Christchurch incident," he told reporters.
An Australian white supremacist has been charged with murder over the terror attack, which was live-streamed on social media.
Singaporean Foreign Minister Vivian Balakrishnan said hate speech and its "more violent expression" of terrorist crime posed a clear and present danger.
"What is clear in more recent days is that it's not confined to one wing or the other," he told reporters.
"But the common thread that it poses to our societies is that it's really aimed to sow division and discord, and to gut out the broad middle, which has been the pillar of stability and progress for our societies."
In the wake of the Christchurch attack, Facebook and other social media giants are being urged to take greater responsibility for hate speech and violent extremist material published on their platforms.
Australia has urged G20 nations to help spur tech titans into action, while Singapore holds a unique position as a technology hub.
Mr Balakrishnan said advances in digital technology, a rise in new media, and a shift from broadcasting to narrowcasting had created echo chambers which affirmed and sometimes inflamed "very partisan views".
"There is a need for the internet technology companies to also take responsibility and they will have to be part of the solution," he said.
"We don't need to be convinced any more that this is a clear and present danger that requires urgent action. It is something that governments, the private sector and civil society will have to engage in."
Australian Foreign Minister Marise Payne said the two nations would work together to hold the global online giants to account, and to confront terrorism more broadly.
"We've absolutely identified the need to ensure that wherever we see extremism - no matter what form it takes - that we are calling it out and that we are addressing it," she said.
"And that we are working collaboratively in our region to reduce and to deter those who would seek to cause us harm."
