It would be nice to have a way to "stalk" a user's edits globally and guc seems the best way to do so. It could be used by users for themselves too, e.g. to post updates to social networks or whatever; or just by the "talk page stalker" kind and other kinds of wiki "followers" of someone's crosswiki endeavours.

Probably depends on T64914. I also assume it only queries the wikis where the user has edit count > 0, because it seems much faster for users who only ever edited few wikis rather than hundreds.

See Also: T64915: [recentlogs] Add Atom/RSS feeds