Twitter’s billions

Twitter seems to have quadrupled in value over the course of just a few months: after raising $35 million at a $250 million valuation earlier this year, it’s now raising another $50 million at a — wait for it — $1 billion valuation. At these kind of levels, one assumes, there must be some idea of how to make money in the future. I also hope the founders are beginning to cash out at this point: or does Twitter really have a burn rate which would make Michael Wolff proud?