So after a couple of hours, Facebook sent me a link to a zip file that contains a rather nice plain html facsimile of my Facebook profile page. Contains the few pictures I uploaded and comments on them. A list of my FB friends' names (and a couple of email addresses where they were available) and the not-very-interesting archive of all the private messages I've sent and received. (Most of which are just co-ordination).
I'd say they did a good job of this. It's probably even possible (theoretically or someone may have already written the script) to import this into another YASN.
What's missing, of course, and the major value (from my perspective) of what I put into Facebook, is the huge amount of writing and discussion I've had in comments on other people's threads and in particular in various groups (including secret groups).
I knew I wasn't going to get this. And think there's a good rationale for it. But it's kind of sad too.
Looking to what else I can recover and how.