Matt Todd, Task Lists in GFM: Issues/Pulls, Comments, The GitHub Blog, Jan. 9, 2013 (“You can use task lists to break down large issues and discourage the creation of many microscopic issues . . . .”).
Reg Braithwaite, Task lists in all markdown documents, The GitHub Blog, April 28, 2014 (announcing read-only task lists in all Markdown documents in repositories and wikis).
Lauren Brose, Video uploads now available across GitHub, The GitHub Blog, May 13, 2021.