Automate citation creation with Webmentions

[garethrees]

AIUI, Webmentions are a bit like the old pingbacks:

Webmention is a W3C recommendation that describes a simple protocol to notify any URL when a website links to it, and for web pages to request notifications when somebody links to them

Some more practical info from https://jamesmead.org/blog/2020-06-27-indieweb-ifying-my-personal-website

[RichardTaylor]

Consider moderation.

Could also monitor server logs for referer headers, but these are informative far less than they used to be https://en.wikipedia.org/wiki/HTTP_referer#Referrer_hiding

[garethrees]

Consider moderation.

+1, a good use case for a generic Approvable (#6931) that could have its own accept/reject workflow and be managed by a specific admin role (#229)