m4v3rick but there are some privacy issues.
What are they?
I'm personally not a big fan of the way Byobu mixes with any other topics (instead of being its own separated things), even if there are some good aspects to it (a setup encouraging group discussions, possibility to make a private discussion public afterwards...)
That said, i would be careful with whisper: sure it seems more convenient, but I have countless experiences of forums which lost a lot of their fun and lively topics when a chatbox was installed – and whisper, with its live messaging, could work a little like that, even if it's private.