Sanderson's tribute is particularly good.
I think Patrick Rothfuss summed it up best:
"Terry Pratchett brought more joy to my life than any other author.
If you need me, I'll be hiding in my blanket fort for a while."
https://twitter.com/PatrickRothfuss/...36697538297857
A great, great loss and a writer that will live on for a very long time to come. His death rocked me back in my chair, and I couldn't believe it.
Kristine Kathryn Rusch describes catastrophic news over phone calls as "phone calls from your knees".
The sentiment fits Pratchett's death perfectly.