How can I set the URL of the "like" button embedded in the Facebook comments plugin?
The XFBML <fb:like> tag has an href attribute, but the <fb:comments> tag lacks an equivalent attribute.
updated for new version of Facebook comments plugin:
The new Facebook comments plugin no longer uses the xid attribute. Instead, the href attribute is used to both identify the comments box and associate a URL with it.
Compare new <fb:comments> to legacy <fb:comments>
original answer:
Figured it out while asking the question:
The <fb:comments> url attribute works like the <fb:like> href attribute.