A wrote
I have noticed an emerging trend for linkspammers to spam their sites on article talk pages, user pages and user talk pages, especially after failing to get their spam placed in an article itself. [[WP:SPAM]] does not have a clearly formulated policy on this from what I can see.
It will all fall under [[Wikipedia:Conflict of interest]], though. At the level of generalities, if posted links are serving purposes that do not chime with Wikipedia's, one can deduce a likely COI.
That doesn't do more than give some sort of framework, of course.
Charles
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