I have grown to like Twitter I like what it is famous for short timely updates. I really don't think it should be used for anything else other than announcements,quick updates, reminders, quick warnings.
From the people I have been following London Midland on the whole they provide me with most everything I need to know at short notice. I was also alerted to my new solar light via twitter.
I really don't think twitter should be used in meetings,where concentration and listening is important. I really do feel it could distract attendees. Now I am unsure if Police Chat this afternoon was on about tweeting to the general public from meetings or to colleagues not attending the meeting which ever way I still think there is a better way to include those that aren't in attendance.
I am sorry but anyone advising that a web cast is expensive has been misled it can be done by anyone for free even I can do it which is saying something. Not only can web-casts be saved or archived enabling viewers to view at a later date they can be cast Real Time. I think a really good example of this has been done by Stratford District Council at one of their planning meetings.
Like anything a web-cast can be for a selected audience or open to everyone.
So my whole view on Tweeting from meetings is it shouldn't be done and alternative less destracting technology should be used.