I have referred people to my ts. I figure they have their own stuff to talk about and I trust that t won't reveal anything personal about me. For me it is a non-issue, although I do feel awkward when I see someone I know in the waiting room at t3. She is in a large practice and always runs late, so I spend about a half hour in the waiting room each week. And "how are you?" feels like a weird question in a counseling waiting room.