Thanks Deborah.
How do hosts know that? I didn't even notice I was in 'travelling' have only searched by topic and not seeing a suitable one in the returns posted using the start a conversation.
I'm beta testing for Airbnb anyway - so that will be a feedback point - strings in search returns ought to indicate the forum you are in and who it is aimed at. Or at least when you click start a conversation a message screen should come up to state this is an open forum for guests and hosts, guests only, or hosts only, 'do you want to continue'; yes, no.
Hosts across the globe have expressed concerns over the issue of guests being able to access host conversations, and whilst they can't in host circle, if hosts are using the search conversation strings you don't know which forum you are posting to.
Host circle has not been communicated to hosts as a guest free zone. At the moment everything is trial and error for all concerned.