Twitter is alleged to be offering a professional account for two hundred fifty dollars per month. The price would bring in an estimated $2 billion-a-year, but that's not what it looks like. This article was originally published on January 8th 2013 and has been updated with the latest information from Twitter about their revenue model. We are happy to make clear that while twitter does have three lucrative businesses - feed advertising, day subscriptions,. and s m s advertising -- they were all once part of the same service.