Btw, the new home for the documentation is
http://shotwell-project.org/doc/html/share-upload.html
> However, after updating to version 0.26.4, I seem to be unable to
> publish to the web. While I have enabled the Facebook extension in
> Shotwell's preferences, there is no "Publish" entry in the File menu.
> Also, the shortcut Ctrl + P does not invoke the publish dialog,
> either: it opens the Print dialog instead.
The Shortcut for sharing is Ctrl + Shift + P; Seems the documentation
is outdated. I will fix that ASAP.
I don't know why you are missing the menu entry, though. I can see it
when selecting a photo. So no, that is not known or by intention.