TBH, I find this one of those "Annyoing Teen Technologies", and I don't really see it as a social advancement.
There is no guarantee of delivery, and there is very little guarantee it will be seen by the intended recipient (if they are subscribed to a million and one feeds). I think it encourages people to sit down and write meaningless messages for the point of writing a message, instead of sitting down to actually think about what they are going to send (a la email and letter writing of the past), increasing the Signal->Noise ratio.
As such, I don't think you could reliably depend on it as a communications system within a professional framework... Others with more experience of the technology may disagree, and I very much look forward to hearing those points of view.