A funeral service for all three teenagers took place earlier at Zakariyya Jaame Masjid Mosque in Bolton.
Greater Manchester Police (GMP) continues to investigate the cause of the two-vehicle, head-on crash.
Five passengers from both vehicles remain in hospital for treatment, including a 29-year-old woman who has suffered potentially life-threatening injuries, the force said.
A spokesperson said officers were “working with the families and offering specialist support”.
As part of the crash investigation, police are examining a video reportedly posted on Instagram less than 24 hours before the fatal collision.
In the footage, believed to have been filmed at 03:00 GMT on Saturday, the driver appears to overtaking other cars in a residential area, reaching speeds of more than 120mph (193km/h).