Heartfelt sorrow and sympathy; TWITTER R TRIBUTE.
Sympathy was extended to the families of those who lost their lives and hope given to those still missing or injured.
Tributes to Gary Arthur, pilot David Traill and police officers Kirsty Nelis and Tony Collins poured in from friends and strangers alike.
User Mason said: "Coming home to find out the news your old coach has died in the helicopter crash. Awful feeling. RIP."
Ex-colleague Alex O'Hara told of his disbelief over the loss of his friend, adding: "I worked with Gary when with Comet. Can't believe this tragedy touches so close to home. Gutted."
People near and far paid their respects, with Gordon Miller voicing his sadness and saying: "Gary, David and Kirsty - Glasgow won't be the same without you and the others who lost their lives on Friday."
Tweeter Arundel praised both professionals' dedication to their jobs and passion: "RIP to PC Kirsty Nelis, who I met not long ago, and to pilot David Traill, who I knew growing up. Died doing the jobs they loved."
Sam Verissimo added: "Knowing David Traill's father has really hit home to me. But knowing he went to school with my mother makes it slightly harder."
A fellow officer also praised Kirsty and said: "RIP PC Kirsty Nelis. And thank you for the service you gave. We owe you a great debt."
Actor Colin McCredie took to Twitter to say he intends to hold a concert to raise funds for those affected and galvanise other celebrities into helping out.
Maureen McKenna also hailed the courage Glaswegians showed on the night and praised the feeling of togetherness it had brought.
She tweeted: "There's not enough space in tweets to express my pride in the people of Glasgow - services, council, taxis... the list is endless."
Scottish Commonwealth track silver medallist Charline Joiner added: "My thoughts and heart go out to all those pour souls involved in the tragic accident in Glasgow."
Hollyoaks actress Steph Waring said: "Awful news about Glasgow, thoughts and prayers with the victims and their families."
Lance Spencer tweeted: "Thoughts go out to the victims and survivors of the helicopter crash."
And Patrick H added: "RIP PC Kirsty Nelis - died serving and protecting her people."
Singer Sandi Thom said the tragedy had personal resonance for her: "As the daughter of a helicopter pilot I'm deeply saddened. But what courage the locals showed."