Twitter finally published its S-1 document. In 2011, I had tried to make a tentative assessment in my post, If Twitter was going public, some far-fetched assumptions.
You can compare the cap. table below to the one in the post (click on the picture to enlarge image). Of course there were missing data and there are still some today. The investors shares are not described in detail. I do not have the shares of one of the founders, Biz Stone, but only those of Jack Dorsey and Evan Williams. I plan to update info when I have more. (A small detail: series A was probably $100k and not $76k for example.) Enjoy and react!