from here, which is an interesting read, there is an interesting comment with the asking price of twitter.com before it was bought (it's the comment from Adam) I don't know what was ultimately paid for the name.
I hung out with S for a little while before leaving Florida - he's a very interesting guy (also brilliant) and has one of the most amazing entrepreneurial stories you will ever hear. From trailer home to living on the waterway with deepwater access in Boca in just a couple years.