Tim Ferris (with some help from former VC Peter Sims) has described the background and early rapid prototyping that lead to the development of Twitter.
Twitter founder Jack Dorsey had been “obsessed” by how people communicated.
In the early 2000’s Dorsey made this sketch :
Ferris and Sims describe the process that Dorsey used.
Basically lots of incremental steps – not all successful – but he kept learning and improving until he achieved success.
Very interesting stuff.
Here a link to the full blog article : The Non-Overnight Success : How Twitter became Twitter