I never ask personal friends to subscribe to my nightly email. I also never look to see who's subscribed. Not a guarantee I never will, but in practice, I don't want to know who's tuned in and who isn't. I don't ask personal friends to subscribe because they might choose not to, and that's not something I want to try to parse. Everyone's free to do as they want, and to not know what the choice was, unless the other party wants to make it known. Complicated? Yes, and still evolving.