It happens all the time here. We were very in with the in crowd at our last church... friends with the associate pastor and other ministers. We heard all the dish on new people.
One place it does not happen is between our old church and our new church. The pastors hate each other. The pastor of our old church having preached what a weak backslider church our present church is over the pulpit... Of course someone couldn't wait to give our pastor the tape. Now it's the Hatfields and the Mc Coys.
Never fear though... we have saints that will tell everything that they know about anyone coming in from any church within 100 miles. Lots of our folks are pretty tightly 'line bred' and everybody knows everybody because one way or the other they are related to everybody.