Sadly SL is still not great for communicating with a large group of people. Whether in voice or merely typing, if there are more then 20 or so of you (even in an otherwise deserted sim), you are awaiting the inevitable freeze/crash.
Funny. You ever been to one of Sean's SL broadcasts?
We've got pictures.
I'm the one sitting on the funny yellow toilet.
S
They might have been refering to discussions between a lot of people. Seans broadcasts are usually (last I seen) mostly a he talks, everyone listens. Afterwards there may be a lot of talking but if people don't take turns and huddle close its hard to understand everyone.