1921.
1922.
1924.
1925.
1926.
Jack Dorsey Drops His Second New App in a Week
(gizmodo.com)
1929.
1931.
1932.
1933.
1934.
1935.
1937.
1938.
A software conference that advocates for quality
(news.ycombinator.com)
1940.
1945.
1946.
1949.
1950.