One question facing many Quaker meetings is what to do about members who have moved away but want to retain membership. Their reasons may be sentimental or a family connection, the reality that they reside at a distance from the nearest Friends circle, or some discomfort they have regarding the meeting where they are. The fact remains that being Quaker requires face-to-face encounters with Friends.
Related to this is the concept of sojourning, with its sense in the Hebrew Bible of passing through a land on the way to another. Some of the references mention sojourning in Egypt; others speak of welcoming strangers who sojourn among you. Readers of Sojourners magazine see its application in our own time. In contemporary American society, sojourning is a widespread fact of life.
Quakers offer a form of affiliation known as a Sojourning Member, extended temporarily from the meeting where one is a member to a meeting where one is residing. I found myself using it formally in one of my relocations, where I didn’t sense full unity with (or from) the closest meetings and I held a job that was likely transitory in my career path. Informally, however, I found myself sojourning among Mennonites and, to a lesser degree, Brethren, who were theologically closer to my meeting of membership and my practice. Crucially, in a sojourning situation, one remains in communication with one’s “home” meeting. During this period, this meant attending its yearly meeting sessions and providing written responses to the sets of monthly queries.
Only after moving to New Hampshire and visiting among the nearest meetings did I feel clear to join with Dover, and even then there was a period before I felt free to transfer my certificate of membership. As it’s turned out, this is the land where I’ve settled – and my own turn to welcome sojourners amongst us.
Jnana's Red Barn 
The Meeting that I am a part of also has sojourning members. This is especially true for young adult Friends who are at college or overseas. The case of sentimental membership I have trouble with because of the lack of as you put it “face to face” encounters with the community. Still, we hold members that only show up once or twice a year from distant homes. It is a symptom of living in such a large country both geographically and economically.
I like this piece, dear Friend Jnana, Especially, “The fact remains that being Quaker requires face-to-face encounters with Friends.”
Do you think it would ever be acceptable to be in membership in two yearly meetings?
If you were able to serve on committees in both yearly meetings and offer other support, I suppose so. New England and New York, for instance, share some programs where this might facilitate the work.
But in practice, I think it would be better to focus on one body and visit in the other.
Good question, all the same.