Calling it the spoken version of a Tweet, Jahah has release the beta version of Jahah@CALL which allows to people to engage in a two minute phone call through twitter. There are some basic requirements, the big one being that both the caller and the recipient must be members of the Jahah@Call service.
Would you use this service if you could find a viable business use for it or do you think this is more of a non-business app?