Social media sites are playing an important safety role as the country braces for major new bushfires and grapples with potentially life-threatening heatwave conditions.
"Listen to warnings on the high bushfire risk. JG."
Fire brigades were among the most active tweeters on Friday as they urged residents to prepare for new bushfires and issued a string of advice and edicts about already active blazes.
Tasmania Fire Service tweeted 13 times between midnight and midday (AEDT) on Friday, including an order for residents in Forcett and Lake Repulse to consider leaving their homes.
Paramedics, police and surf lifesavers all used social media to warn about the heatwave conditions, with temperatures expected to soar above 40 degrees across much of the country from Friday afternoon.
Ambulance Victoria was pulling no punches with some of it advice.
"It's hot - but motorcyclists still need full protective gear. Better to leave sweat on the road than half your skin, if you come off," it tweeted.
Emergency services have increasingly adopted social media accounts in the past three years, attracted by the ability to communicate quickly with wide audiences - including those in remote areas.
But authorities warn residents to verify all information on social media sites, particularly if it comes from an unrecognised source.
Social media is sometimes the only way the CFS can contact people living in rural South Australia, particularly in areas where radio reception is sketchy.
"I've had a couple of people who say that's the only way they can contact us - that staggered me," Mr Freeman told AAP.