"Still can't wrap my head around it," a third person wrote.
"It's buzzy how things can just happen like that... I will forever cherish our memories."
The cause of the crash is under investigation but police released some information early on Wednesday.
Detective Inspector Kevin McNaughton said the pair died and another person was in a critical condition after the crash just after 12.30am on Henderson Valley Rd today.
"A police unit observed a vehicle travelling at speed in the opposite direction on Henderson Valley Rd," McNaughton said.
"The vehicle has driven past our officers, who have then carried out a U-turn.
"The vehicle has continued along Henderson Valley Rd at speed, some distance from our officers.
"The officers did not activate lights and sirens."
McNaughton said a short time later police found the car, which appeared to have its lights turned off, crashed into a power pole.