SUMMARY: It all gets more complicated and easier at the same time.
Now that facebook allows usernames (for use only in your facebook URL), I made my decision and people who are not on facebook can now find me easily at facebook.com/ellen.finch. I think. Let me know if you don't see my profile page come up. But there's an additional web site (fbook.me) that allows a facebook user to create an *additional* one that links to the same facebook page, and so I've used TajMutthall for this one. Huzzah.
www.fbook.me/tajmutthall. Should go to exactly the same profile page.
Let me know if you try 'em and they don't work.