[mcdigman]

This is why you typically want to publish things like this as far and wide as possible - if any single source is compromised, it can be detected by noticing a discrepancy between two publicly available addresses. I'd wager they'll put it in their print edition (same as their physical address and phone number) from now on, because the NSA probably isn't going to everyone's house swapping out their magazines for altered ones, so anyone who gets the magazine will have a hard copy of the address.