How often do you write or e-mail the person when you finish a zine?
How often do you receive responses?
I try to make an effort almost every time to send some sort of short message, even if it's just commenting on a thing or two from the zine. Usually I e-mail, though, because I feel odd about sending a letter to someone I've never spoken to.
That said, I've never received any sort of e-mail or Facebook or letter about my zines from anyone who I wasn't already good friends with. And I've put at least 100 zines out of my hands and into the hands of people at zine fairs and libraries and other places. I don't want to take it personally but it does make me feel like all the people who wound up with my zine didn't like it, found absolutely nothing in it worth commenting on, or just didn't read it at all.
The only time I've actually gotten feedback is on here from trades I did on here. And I've got my e-mail, postal address, and a Facebook group listed at the back of every zine.