There's an HN post from a few years ago with a bunch of interesting reading from the "old days" at Twitter. https://news.ycombinator.com/item?id=17147404 https

There's an HN post from a few years ago with a bunch of interesting reading from the "old days" at Twitter. https://news.ycombinator.com/item?id=17147404 https://news.ycombinator.com/item?id=17147404 I think somewhere in there is a link to a story about how only one popular user (Was it Ashton Kutcher?) could tweet at a time. I seem to recall it ran on a singly MySQL server for quite a while too.