MySpace's exit was $580MM. They had an estimated revenue of $300-$400MM in 2009. They might not be Facebook, and may never have a very high valuation, but the exit was very profitable for those involved.
Twitter can just as easily be great for it's stakeholders and fizzle out as a service.
yeah, but their 'exit' is similar to twitter's current round: it's a measure of how much somebody thought they could/would be worth. I'm asking how much they are worth now!