CoBE's in a circuit talk to each other a fair bit; here's why.
CoBE's typically also do or are involved in the circuit organising jobs - Circuit Accounts, Attendants Overseers, Assembly Hall caretaking etc. - and quite a few get used on assembly parts so go to rehearsals.
If the circuit accounts brother or the CO's brown-noser assistant paperwork cruncher (often a CoBE or Secretary) wants to communicate with all the congregations in the circuit they use email to other CoBE's, not through jdubyadotorg
So an email goes out saying - "The CO has asked me to remind you all that the circuit pioneer meeting will be at the local Assembly Hall on Julember 9th. Please let your pioneers know. Oh and share cars and bring some cakes, for brother and sister fatty to lay on refreshments." Then someone will phone up an ask for clarification and then it's "Hey Bob did you here about ... what do you reckon ...?"
They are also responsible for public talks and will talk to other CoBE's nearby to arrange them (although often an assistant is used).
Any inter-congregation issues (you know, Johnny from City North and Mary from City South are from different congregations and they've been caught shagging each other's brains out) and introductions will go CoBE to CoBE.
They are often of a certain type and they yak to each other too. I know that the Royal Australian Commission, money/finance requests and the Bethel Culls - which may effect their kids - have been great topics for conversation among the circuit heavies (CoBE's, Secretaries and other prominent elders) in my area.