Mike Butcher at Techcrunch UK goes into a touch more depth on the call set up, which sums up as Twitter earning around 1-1.5p per inbound text, but having to pay 4p per outbound text. Which is cash negative. While start-ups generally have to run at a loss, there comes a point where the crunch on money starts to become obvious. Looks like Twitter is on final approach to this point. I wonder if they’re showing a profit on SMS revenue in the US and are limiting exposure elsewhere, or if other monetisation plans will be evident over the next few weeks and months.