Gary,
There is already a system for private communication in place for digital subscribers, however it is not accessible for those that are not subscribers. I have no idea if other folks use the private message function, but for me, I just use email for contacting others. For the most part I just put it out there that my email is public in whatever posts I think a private conversation might be helpful in. Thus far I do not believe anyone has used the private message function to contact me.
I also use several different email addresses: One to which all of my online accounts are linked for "official" correspondence, password recovery and such. Another for friends and family, one for my business partners for "official" business email, a second business email for contact with clients and customers. My latest account is used only for the OGR forum, to which all of the automatic emails as well as any private conversations with other forum members ends up.
I find it useful to have several email addresses like this to keep various unrelated interests separate.
JGL
JohnGaltLine@Comcast.net